Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa5c79fce471965…

MALICIOUS

PDF

87.9 KB Created: 2021-06-27 23:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 680cfa76b2786080b4f928a913818101 SHA-1: 802de4514fd8a1ef20875cf6d889fa6ea7b3003c SHA-256: 4aa5c79fce4719655cb1fdc78e329f9d092550b2a16c586c271a017e7b0b9030
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely designed to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba01ef38acc---80734796750.pdf In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c455e484c---gizodajajefufi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02c4c1dce0---dikotidodawixuseman.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/repepowewo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7d548a0037da14d119262e4d28c777eb/18316709331.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608630763c58c---gomalugixobixanazaso.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/147a15672cff9abe80c88e5d526cffbc/26946865520.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/94237637972.pdfIn PDF document text
    • http://nature-revive.org/files/file/lesir.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086054071a9a---70778673064.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9ff75c970---jazofesosagexisupekafoke.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/32173050770.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/winotugudugezovufitiligej.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/8759856473.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/8bf480e0199f12746c16fd03bd91daeb/pubozelebejukudiwuxej.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/vufazaluxewolewoza.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/3lh84atab7cs8rg64qp7a1s6dq/39024429050.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/95803503337.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/68515502374.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/89cd1a7534d5aa9985e584c5d3b5d060/fumevozilufodibagadafo.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/70934622082.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d240c43028---25732240551.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/45tgfhtf6nvel1mtlprnrfa1eh/riwiwawoxodasum.pdfIn PDF document text
    • http://amdind.com/userfiles/file/pokipasuvirukujarapirel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hollywood+smile+centerPDF 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_off0000f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 18844 bytes
SHA-256: defef35567d6724337360bdb084b2d362cba30dd44c2ed855597b5010cd02f1c
font_02_sfnt_off000138fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FC 10560 bytes
SHA-256: 935647370f52b6336b4d105248ea2c51cd3a500c2e2e7ad73ab1e40a0f502cc0