Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8fd56935428bc7…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 10:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 944eca7b2a2fc2728f79475758407ae2 SHA-1: 9fc2473e5a30c04c2a0e72fe0a553b239293ea38 SHA-256: 3a8fd56935428bc7128dbde6e0d1039c7dc581829fbd61c45c89117f15810fda
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://goldia.cz/data/file/40587001334.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160769df3e23ca---gutulexiwoson.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s28r3n1ecomv19qvgb9toidk1r/65106352988.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/tunuzetesadekoluva.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/vubelama.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2f49ecf3e5c8618e272e5c9b57aeb931/rozanul.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/30a165ff8e521849bc5a421100ecd44d/63404555511.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/pivinujamazadalosodidadoj.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/wufomonujodenifofikivuluk.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/79517655309.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504005724708253.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/punawutadazeripolobuluzi.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/18484034183.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/kesalof.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/julejarar.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b1f18401---kebafukavofav.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5ba8c76af---39900971272.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/3b5bab9dc5a90a830a75970b46b5d5a2/44272239409.pdfIn PDF document text
    • https://isleo.com/i_photos/file/godekosefajubowumat.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b06a110df4fbfe9de6a839d7b029eb5b/muvigozikovewasikadumuri.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/mojuzaz.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/15368427387.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/55bfd290b2bc047a56b22bde97fc9dd6/44132783421.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a758b5eddeb---36784384926.pdfIn PDF document text
    • http://jawarakreasi.com/file/tafisuxidelila.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609462958ae9d---liganoruperop.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/kizolivasisib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bible+jeopardy+questions+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_off0000e227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 17636 bytes
SHA-256: 6b9e05307dff5f3212f3ee50996bfdc298f398225461a814e97b02239d13714a
font_02_sfnt_off00012797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12797 11176 bytes
SHA-256: dcaeb0f054c165d2cfd76f9bc1d281defcd09f9d8badb400aa98219e50e1b266

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