Malicious PDF — malware analysis report

Static analysis result for SHA-256 4901d12fa8b55f95…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 10:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82c1e4ba5517cc7f417e7e0154c47f6c SHA-1: 4640e4f794b580ab01b8990551fde4e60602c0b6 SHA-256: 4901d12fa8b55f9501f7013cd696ae64ed2739b07bd581bbe38aec312c000e5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The PDF structure and embedded content, though obfuscated, are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://chcial.ru/uplcv?utm_term=scooby+doo+unmasking+meme+template PDF link annotation
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/855emmjhn69pjn64m735m39gbr/kolixod.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/kj5674vgk2sr637n1pg604nde5/nutaxozinewedu.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/15389725333.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b655ce09ee0---tarojimikexulazineje.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb671a1de1---veruludubefejutexeru.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cfaee2371---taruborimot.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/addb696dd9a7d30e617276927e7ebb93/wiritanipowidajaku.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5144080cd2---62204736832.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a29848b63cfd934a7c298b30ff0adc57/xotubip.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/e0vepljbu8rd3khkb0hjm702hh/92654892865.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/146e66c949a3dd125c9d925b8bcb2b0f/melevukuwujivagujapuwope.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea87ca1d11---lutubetalo.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c4993850---bigigoladunabavufo.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/38272530870.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e7b2b9345117d4fc1ca394c7abf3d9d1/risobubuzonezodeses.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/tuzavege.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/sidofobifadafanow.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216111733533072.pdfIn PDF document text
    • https://preciseenergygroup.com/media/16392285166.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b670667ed164f1d1f9916344a2f40f4b/wenipu.pdfIn PDF document text
    • http://apcmagon.com/userfiles/71949752534.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/2567157726.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 17108 bytes
SHA-256: b2e4d1a45c477382369f386563b88ff480f27e6cb33b338853f7613b989b483c
font_02_sfnt_off00013134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13134 11280 bytes
SHA-256: d6a0f0737d9b974d2d7482a7e2a6e6ed2ad8bd47661bf801e81a63c47ea1ce9d

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