Malicious PDF — malware analysis report

Static analysis result for SHA-256 727828cc7a51d271…

MALICIOUS

PDF

80.7 KB Created: 2021-08-17 03:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd23eefedd9a4f6f886c11585e257982 SHA-1: 4a3f73c1e6b446a03dbabb539564caa2001891ad SHA-256: 727828cc7a51d27122a815b63792f593ed3bfb6f76dcd45e29f1b9e3d5621482
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the primary attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=how+to+share+files+windows+10+home+network PDF link annotation
    • http://lulanjina.net/upload/files/debifodowefufe.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1611783427c826---7815137967.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608e857a8fc5a---84313787280.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/togonu.pdfIn PDF document text
    • https://ekransamara.ru/files/77653981953.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/dotagujupojebebojiwo.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/16997340694.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ecb71dd9b8011ff62aa75022678615eb/dadugulaxexup.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16116c51230992---wirabonodizawosuzolenijid.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1ouotj0rug0ve2hghrs6h5atnl/3964414011.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ddfd0qd06tdblo7kml5oita5k1/20392392794.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/12f96225f47e472cd6acacc7d88e5d18/zesiniwed.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/juvexekulozajofa.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/93712070402.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/o5l2t0lmhnu7k96bbtkrbidjdb/sakuxararavisuza.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/84ab482fa8237cb89113f00069c039af/76165341808.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kaitarjed1nqakg5stddqqvhl1/11837858400.pdfIn PDF document text
    • http://sun-eko.eu/files/file/bafagopalitudobezi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/i55bojkg0lck51cempaih6ecn2/80385737038.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37e2c8e249---fejunatudurerikilunomuf.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/nivakuliwupoxomirojodegi.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_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 10964 bytes
SHA-256: 80dda0fe838345d36b8082b7b08be4830f1729c573b94d77df5c95f6e4301ac9
font_01_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 16444 bytes
SHA-256: c2b2e7da951514909ea4b70248d9ec185024054a59b9dc24c506e0a6f881910c
font_02_sfnt_off00011cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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