Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9bfce6d244e844…

MALICIOUS

PDF

89.0 KB Created: 2021-07-01 13:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c176c0d9497c7535e2a80986b2a65c4a SHA-1: 614cdfa8203c82c6cfdab0ba7f7bf4fb6d72629a SHA-256: da9bfce6d244e8447a2fec735951794d0abd5e000d5a918503816de107a8c826
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised or disposable domains. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://zuche0551.com/upload/file/bufetotinagolava.pdf
    • https://accuratesearch.com/userfiles/file/36057164392.pdf
    • http://piemonteforyou.it/userfiles/file/96316211911.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/v2u37rp5pgmflce47i3nknhf6d/87589225967.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a557babe8c---97291030163.pdf
    • https://brod-plovdiv.com/images/95418230566.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e348eb86302add68fc6d6da83947ca18/95961430193.pdf
    • http://ainut.fi/userfiles/file/16653447878.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/1kct566esne1en8d20iagi0013/jeferug.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/8flf8dojms6300gftgqb06p5lh/xedipa.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdec3e3412---79551049001.pdf
    • http://heryeryesil.com/resimlerfiles/vewasu.pdf
    • https://wsbtitan.com/images/file/gokizutijetegiwi.pdf
    • http://massageindex.nl/images/uploads/58074315970.pdf
    • http://parvazyab.net/basefile/api203/files/sokezujofuzunozimuv.pdf
    • http://bacsiha.com/public/ckfinder/userfiles/files/dewajimufoduxidafago.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f7b5ee10bd0117f72f2d9e2173f28cee/fomadep.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/40176344409.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c39a436e309---muzutegumugekamoliran.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd99d628b30---ranewapo.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f029e41c19---56674832029.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ng8n1nhjkct7ir3vkpqn5c1df3/vamerim.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42e4c01b00---malewovuzun.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=do+penis+stretching+work
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb5d.bin
d77484e1f59a3819df1af31cb0d3b4544979e0109ebac47972806572a774eb85
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 16620 bytes
font_01_sfnt_off0001269d.bin
d8362f2b6eebb38980e7e0779579318d25eac743edc32884d6ebdf4c616235d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1269D 10624 bytes
font_02_sfnt_off00013ef2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF2 16792 bytes