Malicious PDF — malware analysis report

Static analysis result for SHA-256 d954bf4ec10bcce0…

MALICIOUS

PDF

83.0 KB Created: 2021-07-29 17:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73212746a35ba1d1e54388b479082c69 SHA-1: 4c8971fd5f9382a5b615076e4f0b4c182cedaefb SHA-256: d954bf4ec10bcce045d96cb24f767aeb1b991895397e0cd6b246ac62b09fb2c9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The presence of numerous links to compromised WordPress upload storage and disposable hosting, combined with a 'password-protected archive' lure, strongly suggests the document is designed to trick users into downloading a malicious payload. No scripts were extracted from this sample, but the overall structure points to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://cuacuondaiphuc.com/upload/files/22765628208.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe6692bd93---ragovupepanowokubar.pdfIn PDF document text
    • http://fygl.net/uploads/file/230859435327.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/gpqgb69kp2t6fan5vqv65ap571/62765108889.pdfIn PDF document text
    • http://atiksigorta.com/files/43498466192.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/tuzazabowuninumoviwokal.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/bexamudemeluwezaf.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160812b26e0b1c---79403080442.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/lnuu93pm6gj7iib2q3hjerdpbjdbph8k/73487222140.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///jorogudi.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/mikoze.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/0e5b052d74efb1dabf1a35c13e4b91b4/74325126274.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/rafoxokow.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e70f3d3ac---4225650709.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/78528245496.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/dasitisefinezafazegol.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/nipex.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/8929252574.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/b6rs5s7iqgepjceo0f2ph61kjh/82545314657.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/lifujovajojojeverezu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/kimazirodolafuviketeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gta+san+andreas+ppsspp+iso+free+downloadPDF link annotation
    • 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_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 17532 bytes
SHA-256: bffdb95ad36e46fad901fa16f530cdc1f892e7161d0d4b185a5a62c83a501d92
font_01_sfnt_off00010e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 10616 bytes
SHA-256: f3c4f307b7efc054eb282b420767ffd3d2ac3354e36a6e5c6db53b6f2180f4da
font_02_sfnt_off000126a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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