Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5651f47ea042cf…

MALICIOUS

PDF

89.8 KB Created: 2021-08-06 03:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77808b1f515aef7d3841100666b697e1 SHA-1: fa6c5c33ce27c51d6fe74f703dc4a6fc241f66cf SHA-256: 6c5651f47ea042cf87fe7fcb90e383f9e205d38931d1bb5c541b60e202fe7e75
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Antivirus Bypass

This PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. It contains numerous links to external sites, some hosted on compromised CMS uploads, and one URL specifically mentions downloading cracked software. Crucially, the document includes instructions to disable security software and presents a password-protected archive lure, suggesting an attempt to bypass defenses and deliver a payload. No scripts were extracted, but the overall behavior points to a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=how+to+download+latest+miracle+box+2.27a+without+box+crack+full+version PDF link annotation
    • http://medicapoland.pl/uploaded/file/86645770009.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/85033575574.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/kimojoxa.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/e9175a5932ccb9de36898257967519db/52454798810.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b672e7044---nofemizufopewijopajizuto.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16091f42e31c1f---jurififazolatopuwepukedar.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/63019164933.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/lokowadolejuxolojejodiwa.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/31031135f6761b73ff63235e8ebf29ce/56544099280.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eb4ee3062---rogegodakozelaxefikib.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/18051771109.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/29460077363.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/fc8a080de173ee5b317e4be02477b426/ganad.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160911f42173dc---41795148991.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9b4f616f4ec405d09477ffb3e39b9e6b/63793130365.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/gulajozurabizojidi.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zulaxuzewakikefexi.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/marevegabivusukij.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/96143239626.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bd68b52fe---takuv.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee815d8bead---54076376344.pdfIn PDF document text
    • http://bwc.lt/i/43118464016.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/19859680863.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/jmkj31emgfa1jcdkg4i74p2qrc/tusenawezib.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/67238346221.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0657484cee0aedca0b43949a49a1d787/12566570950.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 17860 bytes
SHA-256: 9314f82fdb8fffbba54f45d77c776b967b92d9c4d58c163c9c41c157b5137a1d
font_01_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8A 11556 bytes
SHA-256: 66a51edfb0c6bcb86c109e6e160f27c08feb1a1ad8977756d4481effd9ee059b

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