Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf2454bc1d5541a…

MALICIOUS

PDF

76.6 KB Created: 2021-09-20 16:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6350e6c68575fd9afad52980c973880 SHA-1: 04c807c53d0f0691c8da2d2b58dadc5e105a09fc SHA-256: 7bf2454bc1d5541a86d3226cba6c321a123a530cd66170f1185a941d8eeabfda
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs users to download a password-protected archive, a common tactic to bypass security scanners. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=gta+sa+lite+pc+download PDF link annotation
    • https://eingangrad.ch/userfiles/files/tebusexijufepemojol.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/14089961140.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d0ae7eec3---pirixanitewupu.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/vozebi.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/xipovufamenojajuxozobuz.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/faritirepotejan.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5588a6b7---92640959908.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/lifadaginukuxes.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/wawuj.pdfIn PDF document text
    • http://keitbg.com/images/files/nagerasezilebejisopar.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/zevezususinepi.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/fubanejomunuzuzigobo.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/58642620683.pdfIn PDF document text
    • http://farashimirooz.com/files/nirepagumonamipopizeje.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/148o51gj82lpk80gttfva6s864/95545026528.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/6061373872.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/tijiruxe.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/jonaremolomevisuwetafanek.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/93859262533.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/qfmrmcvl1f5reg0kh2i2inc3ss/nereduju.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cb470fae694c57c72b4398c89a21d51b/vovadewo.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_off0000c874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC874 10532 bytes
SHA-256: babc94588460059c17f03f930128a9f4244aaba7a158125e73ca1f2b43c2427b
font_01_sfnt_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 17124 bytes
SHA-256: 5ef6b7a0d92965a118a9a26ffaf3fd626dff8467a34b8ed1423276376f826e2c

Open this report in the interactive analyzer, or submit your own file for analysis.