Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4c032b8ea87b34…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 03:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8de5544cd4537ffb0960566769750b34 SHA-1: 1859edcc943ae432be68215deadddc60e390c874 SHA-256: ca4c032b8ea87b34c982fb71a4d3f9ee3f969b425aeb4b5f2d9e5b83d22eed86
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically flagged as a random URL and others pointing to compromised CMS uploads and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=itextsharp+digital+signature+pdf+c%23 PDF link annotation
    • https://egyediajandekotletek.hu/mvc/userfiles/file/butega.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607746870151c---84903684770.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/afa9aedad445191f68da978dbd4cf1fc/12540858547.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/52113640939.pdfIn PDF document text
    • https://menu2uplus.com/images/file/bagoveripemutubiz.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7129497a7c---45075803175.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/561751196.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/0a51d0bomtoo15b959203uein0/wepurosaberuvemusexir.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/db29b003b67ce536e89ad7297dd88b11/nikolelibivedalafizo.pdfIn PDF document text
    • https://wagaskar.com/media/timadob.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/206715475a35ef1901098e2f147be41f/kidumiberinixisagefi.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/jefozibajutexidalumonugeg.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/dagobatuwifuwizebile.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1f4648529cbdd9cef2ec7d6865fbc8c1/fevoremiledu.pdfIn PDF document text
    • http://lyshiying.com/d/files/36886357928.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dee2ed124d68d55cfbd31d87f41ddc92/43433240505.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/21472144268.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abebc05c1c8---66599858426.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/30395143443.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/zerota.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/blldlg9komkqrpit0g83d7q2uv/varifodefogupuf.pdfIn PDF document text
    • http://redactron.com/userfiles/file/nanidizam.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_off0000ba79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA79 16644 bytes
SHA-256: 7634fa31357719fdb95a8d34d71f9571864e10a5233a7e7524f34d2c0796cbac
font_01_sfnt_off0000e568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 10932 bytes
SHA-256: b6794c2797074d9229a33436fa1aa5e21800ad021ff305ece24f5722347de9de
font_02_sfnt_off0000fe82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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