Malicious PDF — malware analysis report

Static analysis result for SHA-256 478ac05fc38f674f…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 02:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd67981fe34297d3695ba0a9f9a1f718 SHA-1: 527886a0cf3a3435a477a1f9ce9d644b336a5637 SHA-256: 478ac05fc38f674f8a06b8a1e6744eccccc37f2e8375ea1cf8e52810df4117f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the ML classifier output strongly indicate a malicious intent, likely to facilitate phishing attacks or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=mekanisme+sirkulasi+jantung+pdf PDF link annotation
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612508dbb1fa9---berit.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/73662582503.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608364e2b1424---70697275851.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d4bcfbed603ba72440b1f0269c9ad85a/66242555584.pdfIn PDF document text
    • http://dges.in/userfiles/file/tosilovulirunijigav.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/pozisupidozivopupob.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/238f98a133eede9e2ae14f77c32b1eac/niwowu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075fda786024---95141810893.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/23887844633.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/250aa572ad22f4ae799897616e375f68/nevodopipakav.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/fulivobodif.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afccc86c6ff---wezodinuvuxaju.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/wagaduzij.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109071751004158.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c0ab13360---vogugavineti.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/37165644504.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b914608776---bulitoze.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/5688c2e1430233f7f0b90438c924391f/20455448412.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/22981554827.pdfIn PDF document text
    • http://goref.ru/files/file/nopubigojimode.pdfIn PDF document text
    • http://cjatkinson.com/userimages/33854027012.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2d40217476d7fdab36a16abaaeb7da24/pikenezanesemeronalije.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/jovodufujuvaretojodivujo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161252041120d4---77596553779.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/legitato.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_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 11036 bytes
SHA-256: 906e36ff51f4d29c4160816eb7a387fc055a93b966e211a4a3559c326d74f4a9
font_02_sfnt_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 17660 bytes
SHA-256: 130b2a2959697acdf67d661dd45510978f3dd09d4f7ba098748a3eb6a7abf2bc

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