Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd94d66666fb52ae…

MALICIOUS

PDF

71.2 KB Created: 2021-09-05 06:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21e2eecdec903e21b85d2d9033ea87fa SHA-1: d867fcf9a3d9b2e1a5be71754097711c2f5f38df SHA-256: fd94d66666fb52ae0ba5c29b5b67297a523ee050ad8daaadb3ad80908a29e6e9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, which is then protected by a password provided within the document itself. This is often done to bypass gateway security scanners. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://xn--j1aii.su/userfiles/file/rolowadekubimiresu.pdf In PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c13781aa---gutituxenufusamegadabotef.pdfIn PDF document text
    • http://apvn.info/userfiles/file/7698155128.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/mamixuwadagadepegope.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/kubovezipetumosutefa.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/4b19a23d08fea59131c9d431fd59b9ae/82095851798.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809b35ea68c---nejomefagulifavinotan.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16124f0be5c0b7---84643804220.pdfIn PDF document text
    • http://didopack.com/files/73717572963.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/xujazijolowimoku.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/detonisenoxikaboze.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/dab17e862b98d9c656edcf69b0c4a197/nagowekotake.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/14252997274.pdfIn PDF document text
    • http://effektfilm.de/files/file/jebosiwejulivosuw.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/92aac7902e4074a230f2f22b9c11ee59/15190970743.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f816088e---81599207012.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/78022253159.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/ragovigejiwizuk.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/tijasemaxululub.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/7d68266380a4f3daae50920859b22d6a/88600997854.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/bosuninedobofurixufosiw.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/78976321587.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/91026554297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=english+grammar+book+for+class+12+pdfPDF 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_off0000b50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50D 11224 bytes
SHA-256: 4426db608f66d77cfde2dd08f26fd2e327346e8ff448c647b3a6d9b43f6f2db2
font_01_sfnt_off0000ceb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB9 16016 bytes
SHA-256: c52912795e8153ccabedfe4afb3a92fdfd66fc8e67a33733df0ef6b06829a1c0
font_02_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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