Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e04480e9ba8fe2…

MALICIOUS

PDF

72.7 KB Created: 2021-09-01 21:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9416126b61481ab0f01a9a6bc496d462 SHA-1: d8189b35c1af5f789b64d178a5249099d1c61c0e SHA-256: 88e04480e9ba8fe25044e7213e06b85a9fc89719653a2cc89175a79ffa606f67
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://wildpflanzen-planung.de/file/jiviwifitelutopojilixuzil.pdf In PDF document text
    • https://vandolderskb.com/images/usr/82868374489.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/12016229641.pdfIn PDF document text
    • http://charivne.info/images/file/waxijugukewatebowelexedi.pdfIn PDF document text
    • https://eclearusa.com/images/file/13378998748.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c963d61163---87050144085.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/lupapatizon.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/kg4617hltbtboc2kv4jp6dgn9l/45233740890.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/bebilasabokoboga.pdfIn PDF document text
    • http://trangtraioirubyhophoa.com/imagesUploads/files/gafukozoxelidip.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/vo2nebtm3stp49p40i8f85o4dr/dinofebototova.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/rukupekibafo.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/bd248cd3ee856967ced6690fea49b332/xariwokejidema.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/28c7452575c6fed4de24c6f0546f654f/lagoraxolabakelekojefot.pdfIn PDF document text
    • http://esistore.com/userfiles/file/23395494025.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90502e4859---42323210216.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/21654474592.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/98184295458.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/38800142535.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/41706283107.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/3d51aac449f4d6eee1ca8974ec30cd4b/bonajimifawazivuraboza.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/97522803199bd095f901f3a5a9d6a75d/98970051761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=chinese+dessert+soupPDF 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_off0000bbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE5 10412 bytes
SHA-256: f05c7302eb5e9005dca930505ca1a54920b609eb98ade755510a2f4312bf7acd
font_01_sfnt_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 16124 bytes
SHA-256: dcd9c8876b862bd1ebce7ea3d23bf0fa14c655d7e232980e0d519bd5d49cd6ac
font_02_sfnt_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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