Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f57b69b03bef06…

MALICIOUS

PDF

85.5 KB Created: 2021-09-06 03:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8ec5ff1168d41a05743a0b2d817ff2f SHA-1: a091413963b4e95625b47d9a004a5aa09fbc8704 SHA-256: a1f57b69b03bef06289ab8f30fc5945c32ff4ebc82a25cff6a33fcf1d6f6395f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm hosted on potentially compromised or disposable domains. ClamAV detected it as 'Pdf.Phishing.Trojan', and an ML classifier also flagged it as malicious. The embedded URLs suggest an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://insp.biz/img/file/jimalazavufe.pdf In PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/65033319231.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/14456530655.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a66520180f3d1a69d0ba48f11e5e86dd/80539339427.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44323c649---76365152664.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/sulowopiregorijulotakobot.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8b0nvu9fedtj8d3ofms35lejhn/domomexijevuzawuxi.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58e6844ee5---11813039633.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f92f84bee52f1b04483af343aaea2ee0/8332172641.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/44698024466.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612340be7240a---11477576677.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/qipmo79oog6u6j0ucp6iupbkhb/50092299625.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/48894200525.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/zimobuwugevije.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160743d8db5d34---pusenovigenanobur.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612d1686a4d30---geligaw.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc544691d1f---51825048005.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/99947887463.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/9fqiu4bnf8im5n1gainr7j93ot/11816699523.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/zariretugofofosugap.pdfIn PDF document text
    • https://cristalensi.com/public/File/jurojil.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/bejikupokilarotesaj.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/kefasufipufo.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/83256019815.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/20627793474.pdfIn PDF document text
    • http://halmar.info/userfiles/file/tuwuvar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=lathem+time+clock+7500e+manualPDF 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_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 10684 bytes
SHA-256: af01f42e19d58a2e797fa60b1c73d64e740e3c64256f6fed670b95e1bc092c29
font_01_sfnt_off00010103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 17972 bytes
SHA-256: 77bdc0990c813098a907ebc49b5949049caa2cb49e90bbc9678e30f9da0988dc

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