Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d846d3a34744d7b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-21 00:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c11aab38dacd8be9457424b90af5ff80 SHA-1: 2d3f4e908829733e8601cfb7536a1b2d7478adb1 SHA-256: 9d846d3a34744d7be97754eabe0803cdf1a47bfc372be3755480073335cfada0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/uplcv?utm_term=pitchlab+free+download PDF link annotation
    • http://td-mg.ru/uploads/files/86183712581.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130315504433---nadabas.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/koradikizelabuk.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136bafa48208---zakoreta.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/86564790960.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/molipesariwepidunoxeni.pdfIn PDF document text
    • http://geose.ru/userfiles/file/87942656388.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/favixafejazilofudepex.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/32764251180.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/91645538627.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/72145394505.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/lobiz.pdfIn PDF document text
    • http://danbikoreansj.com/uploads/files/66503851135.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/depejogakabususejemivodek.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/56090349386.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/24139955247.pdfIn PDF document text
    • http://sro52.ru/uploads/files/47593388162.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/lobarelakutap.pdfIn PDF document text
    • http://placc.info/up_image/17575309721.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/49766476729.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/21850553857.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/34ce2feb50032083edf153eb60a76563/69615182845.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/93381331413.pdfIn PDF document text
    • http://health-bridge.in/upload/file/74547604356.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_off0000cfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 10632 bytes
SHA-256: cbc3a47d335da96d6481bf5d87f139fd779d1be82c81ea0cfdd3a76cef7e2f42
font_02_sfnt_off0001001e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 17244 bytes
SHA-256: 8cc10aec42a71876e1f51383198c8c80044135878948ce34ef22eea6f82b299e