Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b820075ceabac3…

MALICIOUS

PDF

82.0 KB Created: 2021-08-15 06:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68e1adf536017208962bfe51f08a5f1f SHA-1: 467d62882ca5805a33d8c6eb99e0156c0f54c0af SHA-256: 55b820075ceabac355e8b87fb6c13cdcbdc1d21ae457b43d0e5dee0eb2712173
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to compromised websites or disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of numerous external URIs suggests the document's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 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://pixomot.ru/uplcv?utm_term=how+to+control+panasonic+dvd+player+without+remote PDF link annotation
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d64ce2d52be1fea39947efe0cf3b087c/neruzukudovakam.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/vomivovumitetojaroj.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa9716050---vegekotimoxoveguwev.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ded23a30f62---xuzeseze.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3a35c1ad7ee9cdae33608f29983eacd0/21346181100.pdfIn PDF document text
    • https://slide-bearing.com/d/files/boledejoteruno.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/66461323096.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/70715666300.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/vewutopabekajepise.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/zebavuf.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b932726a0---kumadexibovekagebagudisan.pdfIn PDF document text
    • http://3q1p.com/upload/file/210725033433896626zesygyfvaram.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/69096351778.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/xatogofidirezidadokutivam.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077571f622f0---90452553491.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/78453439627.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/d6ccu86s02g6fit94i7r2626e6/26319095853.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/jolonolok.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/gawaw.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/97762755388.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/jebimidupawesux.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161030e7f3a956---37896967019.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/84371055976.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_off0000dd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8D 11136 bytes
SHA-256: 6fcc4837854f38e5b01bc1d0b14c806fb27b2e064c96477c45bbf505e215aba9
font_01_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 16280 bytes
SHA-256: e76d3231f565b63834eb1a75172b89437a1e207a005fc23d3cfa8ca1f3822bdc
font_02_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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