Malicious PDF — malware analysis report

Static analysis result for SHA-256 940c636e657374cf…

MALICIOUS

PDF

128.8 KB Created: 2021-06-28 03:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6546c6749408f02289285a8022bdf71f SHA-1: 5c13a57327413dbccca841458a8028cd33876dd0 SHA-256: 940c636e657374cf226a1d82bda273cdc595cae5f7e2fcdc9ec9347d24573ab1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous links pointing to compromised WordPress upload storage and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b411988c417d2788ef49f364313092a7/tujadurebajobemenopepugo.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99cad24ac---66697592641.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876d68166eb---93464761646.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/302f4962db24c74acfee370c86c2fbe3/23077649957.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d90e50de56---96650346880.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/xexuni.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87af0bb2d---nupipemukaxazuvop.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e9c0747a1---pugodikeragopipox.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609868c5714b4---vozifovuvetaluwalilarebex.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/smv3kgffvsa9vs3gptobomg4a6/kunetanutosi.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c425d54cf3bedfa83dfaa855e3c67f6b/furupa.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf97298666f---34981349983.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097186f0174e---40288480401.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9abe1cf113---84393899445.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/netajoq4okfhrc0eoceh3k4ap5/34974853843.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/691a9ed867ac74021cf71792146a1bd2/sevazatoladojosis.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/zifekurame.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee1a00494---woxuvunogedelamuz.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/q3ovdi7f24k2tb3cf7fktvmmbp/9674615346.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/tl83qhvqvjq52v8le579786mip/29545983230.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160acccf144752---90066380496.pdf
    • https://invest.pl/userfiles/file/fevepinokurefal.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4826ea82d3---85202703139.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=estoppel+in+evidence+act
    • https://bit.ly/2GDgF8T
    • 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_off0001994e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1994E 16792 bytes
font_01_sfnt_off0001b160.bin
2124b9347851cc18a9e4eb92624c8d05715f550863adea8f0fd4257220978912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B160 17108 bytes
font_02_sfnt_off0001ddbc.bin
da0daf87837fda5bdc775b6726230120884b899e548a8c0dfbaceb9546456551		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDBC 10456 bytes

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