Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff3f54c4098a85c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-16 18:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 835e8903eb1c511ad188e9712bf4c054 SHA-1: b392827c443fc500bf88dc517c14dd7a783a7721 SHA-256: 2ff3f54c4098a85c3873ce68b57de9a3d5eb090d43e538438348286fe5a99e33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://okazionche.com/files/26785040343.pdf In PDF document text
    • https://bandai-k.com/userfiles/file/68291204888.pdfIn PDF document text
    • http://villkasz.hu/editor_up/72566596444.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15b42f632---68046460073.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161330996705a8---tuvogitumefaroguf.pdfIn PDF document text
    • http://safetruck.gr/images/file/wimenevos.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3455d737f---jivonolu.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/14137066655.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141c7aa1a09e---40873529859.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/288e04929272cae3f87c89d6110621db/fugarikudinerikedijedij.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/jubalojusa.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/zesutujotuzasefozizikut.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/xexowon.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/6117259906.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/93307004832.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/15i5tnfn7m31nr42n99srs6cvm/mofifafiviwu.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/22216012297.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/ramiled.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/wolevomu.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/4d7a839bf3c39e77cf8dd05a8e734af0/68213138087.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353c6118189---88269254975.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/14139756278.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/27775496816.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/70229412071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+app+benefitsPDF 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_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 10564 bytes
SHA-256: 176b7e9f513a868d62d52a7265cc47442a5b580c084e5a2956c2fbb74a38f54b
font_02_sfnt_off00011f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F90 17180 bytes
SHA-256: b5dedf2ae3817afcbf731b3bf54b30cb7f3921794fdd913ded33bb577bdc2ebb

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