Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac8494028e43f58…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 14:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a5702575710da8a5d55b469bc9d36997 SHA-1: 16c7d3bda8f38d134944e8f3e7e59415545558ac SHA-256: bac8494028e43f583141b0b0b646dca89c0199284ddc4d2b51a7842d3741ef0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms on disposable hosting. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly indicates malicious intent, likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=all+free+sms PDF link annotation
    • http://leaders-adv.net/userfiles/file/58035944423.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/40236937000.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/23221672332.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/roduvebod.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/vexamisamusuzusozebiv.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/42254124394.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/diwodavipupaninivaxiru.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/nefenifadeferadupofami.pdfIn PDF document text
    • https://33mobility.net/uploads/files/nunanekode.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/wobogufuxemurezol.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/wazujunafawuwujizezazu.pdfIn PDF document text
    • http://juha.be/_files/file/63075719381.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/gejaxotixatotik.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/98487860973.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/cd2e89faf740b9cd50ac8c778afb6b2e/51438871406.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/26747515428.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d0337701---14487689298.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/mofudakemoru.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/rugutites.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/wiwag.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/dadep.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/jepixam.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1ab6d15526d228ef9e1ee156af1dce90/vafegoziw.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/24971114be67f0003defe249eae481c9/narimulisajumow.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_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 17760 bytes
SHA-256: fa4ef53d1220a055ae833b6a68b269097a8139c5e301faea5607aa569c8c08a6
font_01_sfnt_off00010a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 9780 bytes
SHA-256: 1ca07e80dd40ad7289cde7075e44855239d3edf6d52621c6725f298a1a5da203
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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