Malicious PDF — malware analysis report

Static analysis result for SHA-256 919cc19f9347fbd0…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 03:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80a29cc2566769c209438950bf4c6219 SHA-1: 0ae730a1fb73d8c4989f6a8743dc8c4c3d51bff3 SHA-256: 919cc19f9347fbd08d20d1d3f770b78bb094cf766d5beab741eed6c59883d362
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/fa4d84cc6bbf10d10b36e30f400f0b5d/nutasesosizupu.pdf In PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/49913995339.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/3d316284cc7a29f2172f31e04ac4e347/99114504995.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/wuforoveget.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a777bf41de0---tideseberamobezeme.pdfIn PDF document text
    • https://laps.pl/userfiles/file/86957661719.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/72742112774.pdfIn PDF document text
    • http://effektfilm.de/files/file/rabunitupilisananomis.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/jekigepeborojoj.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/pubugobawibo.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/59956598389.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074930ebaed2---26168423070.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/velel.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/zunizax.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/154308550d2b0fbf5588341f4c3027d9/kovegego.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/62275064452.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/xuruponifuzi.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/wizebemururuzuro.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad07ad6f2d0---85444635372.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce9ad1888---lumefelomabudexujabu.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/wuvapakaneb.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/dbffb49d974b7dddaaa7f0f85cede5da/fudazajuwemas.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/427f0b595370e6233426697bf01a77aa/tiwijakosodojuj.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b789c428fe5---35688826652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=anemia+diagnosis+pdfPDF 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_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 18056 bytes
SHA-256: 1c1821132e11b50eba8768e4197d0bd7d312e4f925542a490d3f6b6109bbe305
font_01_sfnt_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 10580 bytes
SHA-256: 043551b7b718cc3796d1ff2235caa0555fc53767080725f2dc4455145aab51f5
font_02_sfnt_off00012805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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