Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff972399155958e8…

MALICIOUS

PDF

59.5 KB Created: 2021-09-01 09:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3808cd15388526db27086451fd6303eb SHA-1: affe0b46a7102c4c2ee9c4c4e384529cdf08dd7f SHA-256: ff972399155958e8bb45105a7115594616472b7bc47f40999da42e2d280a5ef4
94 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple external URLs, many hosted on compromised WordPress sites or disposable domains. This structure is indicative of a phishing or malware distribution campaign, likely intended to lure users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URIs suggest potential exploitation or redirection mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9628

Heuristics 4

  • 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
  • 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://csc0535.com/userfiles/file/20210624162529_aus4vz.pdf In PDF document text
    • https://giovannicaputoboutique.com/file/nejexegolugasab.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/nilevewudikedifimovad.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c3cb49f979cbc8f26b0cf0ab70a2439c/91480935736.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/8960181130.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/5912f5fc89ae3ddba24900e27f91da32/51574444016.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/51589046151.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac812194878---10321463066.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/73884458141.pdfIn PDF document text
    • https://serka.com/serka/upload/files/ginarigakopigibof.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084a82a0966b---dariragaweluzirebemadox.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/xomemegiviwisixo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e137986bf019e32062235a51f9786984/29480646073.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/rinifose.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/15065196220.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/41439973330.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/r93tcpqpu243l96cpmr9r6u2r5/60992560031.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e0355771d1ffe72c608bd8450f4c733b/56038300359.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/60460504792.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9da7e84e18bb17072cd01d234583273b/96902352675.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/33048152618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=reference+page+examplePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB37 16496 bytes
SHA-256: 771f693b078df6a27409d4568832e3c05993352a2fea5ac43a5671ace08276b9

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