Malicious PDF — malware analysis report

Static analysis result for SHA-256 1437bad72b17f67e…

MALICIOUS

PDF

96.6 KB Created: 2021-06-29 12:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 70d5973c1096a2db9e31c4513e814874 SHA-1: 0c3d12d24d4af7e14c4db6c36cb9ae94b437c0c3 SHA-256: 1437bad72b17f67e09d1e45eab80fa8a2e3188096db756c771de41080412ffec
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.nomorcantikjoss.com/file/2816588005.pdf In PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e7191936---xuxifopujagagujumeki.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3dd3aa5d1aed989b12927e1c1cb56fc3/10640771029.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/fetiwisujagam.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/dee167e6c8884e4f3542b66f79726dc6/xenozobodoxula.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/zifikixoxifimuvazagafo.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/5d9142784aceffe4f7738176234c4110/gepokesevesosodezef.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090cf7abc827---sifuf.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/juvedoju.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb2c7a4146---20838756112.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b10eb94c---91358696201.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/kowawedujukopevexa.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1fce778b---80767980204.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab69990f775---36187918749.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/74531402416.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/47720473389.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718142cdfd6---ranupovile.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/73cb47a765a5529fd6675a0a5c526be5/mejiwamadukomunapu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160855a7a49da5---fitavuwu.pdfIn PDF document text
    • http://tano-cable.com/d/files/lenakilaragatopanetide.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/le18pul42t1m5bv2od4qv69khp/kerazepebawawepudovazokij.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/85300470f321527a6bf2f2cdaca90c0d/81540096722.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998fda72d61---84988400410.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/96557057838.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/vc7oajrom5nbb9c1pak7sbc20j/69148620624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=vibe+with+you+meaningPDF 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_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 18388 bytes
SHA-256: ecf74583a8fb7e11d46a48831a8de38a23e512e77cb7fbb0beccec9de3ad9810
font_01_sfnt_off00014345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14345 10652 bytes
SHA-256: 4f9f9b02751863939628ab320ad32e4f1fb27eeb2a13a1601d32079b1a355f14
font_02_sfnt_off00015b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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