Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18700a8a00ca921…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 03:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7c75cc9264b31a76635a8a828e31071 SHA-1: 22cc2d1f0b1db0719a3d2b406e7f91069ee6327a SHA-256: b18700a8a00ca9213a07bfd94c0169348b9f9f5a93d6bf1b1be26b949d3abeeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites or potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the document's structure and URL distribution indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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://okudshava.ru/userfiles/file/guzef.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434e51d1087---gipedapapoliselaluraxano.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/tofesiwonovakawefa.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/tasiximatirader.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/dedefifosakeniremos.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/napixesojagij.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/1538676956.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/aaf07226699f3c70218945e0461a465b/14732580333.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/savezizove.pdfIn PDF document text
    • http://varvshistoriska.com/file/63164948445.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1cdb07c82872cdc72e5bb4e287d6d96b/75108000370.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/12257148818.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/biwizep.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/34797343498.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/26551787270.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161431829a2b2b---38669621634.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/11398210377.pdfIn PDF document text
    • https://expomediainc.com/upload/file/56508627896.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/boxeles.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/vufajopipemi.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/51556431920.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/54990191414.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/36395591714.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/nuvig.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/vigagobofuliv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gangstar+rio+offlinePDF 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_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 20044 bytes
SHA-256: 629edacc5017a2cfb80b73e3ed25e175f090bcdb1aa90fac6ce0d7167708375a
font_01_sfnt_off000112ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FF 10428 bytes
SHA-256: 69a480541ddffed9241b03a25b97758ec9c93f551c81293d3752dbd6443b514d
font_02_sfnt_off00012ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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