Malicious PDF — malware analysis report

Static analysis result for SHA-256 54494a3efb971ccf…

MALICIOUS

PDF

79.3 KB Created: 2021-09-02 02:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 583882e1aab35d06987a7f52c129818c SHA-1: 14bdbc0346f73d7fef5d54c259ee68e89421a643 SHA-256: 54494a3efb971ccfaa77700c805e4ee238af95099712da7bbcfb4d4bb98b9761
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URIs were extracted, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://archism.ru/uplcv?utm_term=the+enigma+of+amigara+fault+ending PDF link annotation
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca5bd6c0c---rejojamilupefit.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/47462085078.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/82848726089.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/be81da25c73dc7e469ade653e2247688/bajujogotukatavevozumil.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/fb309df5d3dfa980f3cbbf105d2905ff/35112852100.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119fbe80abac---borajet.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3d060ef4---94384290853.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/nigiwejaxepizumogapomoge.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/55691239054.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c54074966ad---pibubevelojiv.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2678b138f209ad6268c47fddbed93960/xujujepalisuxomidola.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5lc8jgdr370cl2spqcjbch44bq/24552795042.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9ed1864df---dibidikotozibevujejotuxus.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b09f08d92f3---pezegugef.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/22025718293.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/161292bfbe74af---kazaximikisan.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/31339313922.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/birixanoravadole.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9d266ac35---numonuwo.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/pebinadopizalosuxa.pdfIn PDF document text
    • http://guowangcable.com/d/files/nisezobimijolulizobulamu.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/fexipedopawojefedokituwe.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_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 10696 bytes
SHA-256: 5ec8e33c049bf86193951260b4523423813975089cfae997808405f8b1d712c7
font_02_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 16224 bytes
SHA-256: 051046768c2037aacd5492a697fdbe8031b1b1e29ccb9854187585dbb9f58e04

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