Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c33a1ff3017834…

MALICIOUS

PDF

73.5 KB Created: 2021-09-07 08:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51783f3bab85b049207a61291038d00f SHA-1: 5d270a3e1fcda30e225be9a962a58788031e7da0 SHA-256: 00c33a1ff301783455d0b2eca727fdaea72714c3e0047486cfab410e00ce050c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a vehicle for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://starfoil-mail.nl/uploads/wysiwyg/puzuvazudiwojijewutal.pdf In PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/54443881253.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/7318099588.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/3a6ef0f6daf67f838e32bdb3fac4ad8b/78208894009.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/31241776535.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/83263747923.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/kiwikonomakapadafewod.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/06d410b6215ce914b28f27253059cf30/36197585462.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a86b0d9bf9f---11286230353.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/f5qv48j63kssn41m6e19qhdv50/31923193804.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8hp6596jkq62289f1viot15qs/ludawizarugetesi.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c63ba7f7---36753903088.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160738a010a077---repofupomutodovud.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/fawawenarimusene.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/89472086776.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/q7id4lr6kt0hgoo2r8tevvgbst/30606863590.pdfIn PDF document text
    • https://andana.us/files/files/puvejimaxikusowes.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/f2437778bc65b7a3be93ffdcd079625f/sujojige.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/36250511641.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/255a35b93a36bbbfe5436b8eb615371c/sabipawinuja.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/91f457ea27d8b20e7f08a78577a82d16/78548820457.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/84370567051.pdfIn PDF document text
    • http://zuche0551.com/upload/file/gusilusimevowunib.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/753d114f346af8a33ab59ae00a33d542/dawapunew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=manual+nokia+105+dual+simPDF 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_off0000bcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB9 10572 bytes
SHA-256: 25eb52c01f61c7897fb39a485e6c26a9a71ffddc4abf372aad981e38b50ecb15
font_01_sfnt_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 16836 bytes
SHA-256: 0927546ebd2e85dfcf53d365d7d6e4c8839ce2ece81ec70096aa9ab69264a39e
font_02_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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