Malicious PDF — malware analysis report

Static analysis result for SHA-256 38787881310e5ff2…

MALICIOUS

PDF

100.0 KB Created: 2021-07-28 01:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f043bbdf7b231a6fdc8cbbd434ef75f8 SHA-1: 70088080bd0b331fa7013ffab3f3dada70c60b32 SHA-256: 38787881310e5ff226e53f91fca176a75f1187fae98ce5492d5c30a833087f0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to PDFs hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://amoy-art.com/Upload/file/82104505122.pdf
    • http://blackhorsesc.pl/userfiles/file/nefuxefosupejovejavudip.pdf
    • http://liccuza.ro/stiri_files/file/dukexojurenogetupug.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/guxevozazawakovo.pdf
    • https://gomaihoa.net/upload/files/6434845755.pdf
    • https://szabobuszrendeles.hu/files/files/labapolemewojuxitowabu.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adf66ae8550---65801642484.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/59affffb81f157ef45a302b19e787249/89621213415.pdf
    • http://terlickodds.cz/www/www/fckphotos/file/juvavem.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608478a3d803b---2014470104.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608540acb2f2a---48858277022.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081005706ed8---jusituvitotetana.pdf
    • https://vivaldiroberto.com/img/files/mediafiles/file/sapobirobitudo.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a809e05ec3d---53105644547.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd374001cd---15216955808.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/u1g1da3lhjvi2m4pkit3t3k9nv/zitakafisebole.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e7e3445de55045497ed184850a7b8d84/16824483792.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28e1605ef---39069806110.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b4f9a7e1a---84148554075.pdf
    • https://bodegoncriollo.com/userfiles/file/kelajumeworu.pdf
    • https://tradingphrases.net/userfiles/files/zutufodufonefugelutepu.pdf
    • https://livres-d-art.com/ckfinder/userfiles/files/36665199121.pdf
    • http://constantemails.com/userfiles/file/162621216191509276754.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/wovomexakinowugezezegon.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+nintendo+switch+games+2021+reddit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012149.bin
6d3bff64d9c732a66d1e3cddfc63d0ba6370e9a985154a243382b348dd357850
pdf-font-stream PDF embedded font (sfnt) at offset 0x12149 11204 bytes
font_01_sfnt_off00013b50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B50 16792 bytes
font_02_sfnt_off00015362.bin
7f6e33c7ef1ebf58d2bcb1105963f0a9e20d3dedae2dfe32973f6d73dd957482
pdf-font-stream PDF embedded font (sfnt) at offset 0x15362 17324 bytes