Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34a935fe31a7b8f…

MALICIOUS

PDF

88.1 KB Created: 2021-08-24 22:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 37714fd1fe2820e3e761c83b6a6056e5 SHA-1: 46acbf5062a559dd69b0a11146a0ad173ad05d62 SHA-256: d34a935fe31a7b8f3514c34570196ac7e69c13cd5395e1ab3ab5bd66c04f6d6d
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to disposable hosting and compromised WordPress sites, suggesting a link farm designed to distribute further malicious content. The presence of urgency language in the document body further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://brothers-music.com/ckfinder/userfiles/files/fepisapazut.pdf In PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/motifonosuviwudegagako.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/sapukotebinukurokaxowipuj.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/75743465289.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/morutofonedavereg.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/72119663103.pdfIn PDF document text
    • http://ruresept.ru/files/file/dumaratoriretewenonovi.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/36890332853.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/buguxadeputivojovepip.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a235a4dd2---leron.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16e2578eb2---75335272539.pdfIn PDF document text
    • http://profm.hu/files/file/jejexetupa.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c18d426512---43170229985.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/zedexamuxitesilix.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3fef04e8d---vilam.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/0774a6b21b2dc48b88cf23993ab09ce6/xekixirulizorigegekari.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/xufagexebivafigomirebeki.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/93359919394.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/jozemafelonimaguwur.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/69a6087dec8051493628d626f2ce7a0b/42042653370.pdfIn PDF document text
    • https://motacademy.it/file/kogevaketope.pdfIn PDF document text
    • http://runo34.ru/attachments/file/54528442000.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/tajawukoj.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/369f37fb0849aeb9fa671857748864f4/surelutukaxegijasuwigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=balanced+equation+questions+and+answersPDF 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_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 10748 bytes
SHA-256: 99216cb74490c28633cd658fa8efa1df0353629f89482dc6912d1f57c067d5e8
font_01_sfnt_off00010bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 17288 bytes
SHA-256: 1bd3385210e501dd2fbc86760f63af3322fcc433c6bae3265df1418aa5ddfc2e
font_02_sfnt_off00013939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1