Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc1424811372e57…

MALICIOUS

PDF

112.1 KB Created: 2021-08-19 07:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24cbd359e3bc8f3443d6dbad069e2572 SHA-1: 9243bec17042442dab02bf720bcae67f34cad749 SHA-256: 3bc1424811372e5712c9ec6d1fbf2d4a4f7e5a548c142c388671f341c3f2a7a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and other potentially malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning to redirect users to harmful content. No scripts were extracted, but the structure and embedded URLs suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f276319b94---34378926955.pdf
    • https://alshamiltrading.com/alshamilfiles/file/73680332073.pdf
    • http://chromoink.com/updates/file/razoxakokelawerusi.pdf
    • https://megashina24.ru/files/files/toduforokumulubuwofebiw.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edda93e315d---70339787483.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/o12hr2hl6dcj6ilem9kc652bj1/ninajiladirivaparofuf.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/cc43f72c58446dd98a0243f9b375a422/vidasijajebejawazifamu.pdf
    • http://esoftland.com/userfiles/file/85894380973.pdf
    • http://citadelcaralarms.com/userfiles/file/85666047576.pdf
    • http://anthonyvienna.com/sites/default/files/file/fezutorivapijuj.pdf
    • https://altaspin.com/calisma2/files/uploads/mavevigizox.pdf
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/18345259784.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a698e881f41---neduripiduw.pdf
    • http://women-for-marriage.com/ckfinder/userfiles/files/pafirefikoziwunisufajimi.pdf
    • http://bigandtallking.com/userfiles/file/sisurexivavufulelixinijad.pdf
    • http://teechart.com/uploads/images/files/jarebudix.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741bd221b5a---98948836887.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c1904177b---xiwafureja.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f2d18dab8---62949650918.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc9e8b3aa1---runegeninakogiziteguwot.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/8104604530.pdf
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/fuvifuxisudotuvap.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/5gjkd9ia963067vl9opf4s636o/tuvijuperorekomikokopux.pdf
    • http://olgapolyakova.com/files/files/relotazuzuxesedakafumi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=eichmann+in+jerusalem+hannah+arendt+summary
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153c8.bin
7395e20013575d7ae20da30b9ae2ae82977dab02656bede8c134607d538bdf92
pdf-font-stream PDF embedded font (sfnt) at offset 0x153C8 10844 bytes
font_01_sfnt_off00016c93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C93 16792 bytes
font_02_sfnt_off000184a5.bin
5687e79ff9542f4285e92b29aaa5809c715d6d03177d577864c67bb09459e842
pdf-font-stream PDF embedded font (sfnt) at offset 0x184A5 17552 bytes