Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f7600814ff5301…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 02:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c098c811ca69d3c5d00d1c6d497f087 SHA-1: bc8262f3ca9d95bb36a8223b850c72b49e365f1d SHA-256: 80f7600814ff53011d3ceb0802ffb8def395fef774a14b167fc75dc70651b932
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sciattella.net/images/file/ruluvofanofumemegel.pdf In PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3d701e9e---napodurowojabusuruzidis.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210902071438.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/pesakakonamekepuxufixibez.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b33755b678a---vezipalibexagutivalidu.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/35637446745.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/sanuterede.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/wuliniputazopav.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/tadenedubuxe.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/30595640323.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1a88a8380---pojulofoxunasuveg.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/3308176586.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/maloduziruzutisonepejaw.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/71899843911.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/bojabura.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c07454e5284---87797798492.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/9gtfll4fgv8fn2s7lre0d293t3/saxezoregigumijibuxadizi.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/vevunozodumup.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/75109584412.pdfIn PDF document text
    • https://wodgluch-projekt.pl/userfiles/wisodiwogabunaxomukeve.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613158edd3cf1---ronidasewem.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/nijig.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7bcfe5757---jekimezapuvezubimadoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cours+%C3%A9conomie+politique+l1+droit+pdfPDF 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_off0000d3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B6 11104 bytes
SHA-256: e11db192f40fc087c49d69a0f7d62465ddfca4002d77c6b43e91e185ace52f9c
font_01_sfnt_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 20580 bytes
SHA-256: d2b90982744818b92aed0b659d7c9ac1904ce753a01b10d5fe11a2ac2d96b6f3

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