Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6906d9c1906d43…

MALICIOUS

PDF

88.1 KB Created: 2021-08-01 08:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd4dc084fbbb4e0c501d587bbe86fd78 SHA-1: 7bd99ca07d9368b45decfb96e352226cf35e9257 SHA-256: 1f6906d9c1906d43a4a6cff36cfbdb5c832f36f28c914ebb2a8b53719ddcfa02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and other domains, suggesting a link farm used to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

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 https://krisoc.ru/uplcv?utm_term=vw+beetle+owners+manual+pdf PDF link annotation
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/73063813168.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94575b6d39---depebizelif.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/7535264412.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/27759620643.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/vofotinujudazaxojadila.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160711ffd976c3---kusapafiralun.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b933370a043---jidopewizewavagud.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/bc8fab9175c615997c4c4c2a07d6e091/fizabakidevifigurezasilu.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/jisejosuxizozuve.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f33ef9ab9b1---32133228131.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/7488157492.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/febibolujet.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12fa93683---87633710425.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/pinapufolademi.pdfIn PDF document text
    • http://azizolace.cz/images/file/19444016805.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/tawemaxijo.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/pofokelevotobute.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/304ebd91a1343adfa07a465d0d392c44/31923353694.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ilv2jdccv74ehe17tbgtivcbti/41713507373.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608778556af0f---99458231205.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/konutujar.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9337cb89dda4ac336d9156d65492f9a7/xodosemulenumilijosug.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/85806748696.pdfIn PDF document text
    • 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_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 16784 bytes
SHA-256: c8cec112cfd75dbf2806a5130216979944ad6139ebb98ed52434c55f843e3ea9
font_01_sfnt_off000121cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E3 10864 bytes
SHA-256: ba93e0b79ac3fe4bc4bbdeb6a3674ee6c37984e72ef935d8b80c415641202b8e

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