Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c43b9a6576814d0…

MALICIOUS

PDF

87.0 KB Created: 2021-07-03 09:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 97703f4c01d5425286108b1500c91479 SHA-1: 2403b4d9f46ec7c68d8365e2da37faf27348f1a3 SHA-256: 3c43b9a6576814d0d08fd797884ecd0f25b7805e2ca2548cd303d0b1b8ab0970
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e79ed6d7a8---kitegaxonatumakuloridapa.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rjmohavjm3nejsnu8ja7ploua1/30966782878.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/2365707338.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/48961503593.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/27460329418.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b9284d905ce963bc98fd2f438e6933a5/83967013764.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/xitabosupunaneba.pdfIn PDF document text
    • http://aps-mes.com/files/file/29617170826.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/98600376545.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9f569286de6f0ad9ac60d3211d59a024/xivod.pdfIn PDF document text
    • https://chp-travel.ir/data/file/78989597743.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/65169253748.pdfIn PDF document text
    • http://digifast.cz/userfiles/fuxekejolikilafi.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/kenujinuvafexibodimok.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/pos0085p7l20mphvdg1klbl5i4/zadavuvitedupazoxozen.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/vavisidadivab.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c29d3f1e691---47550179182.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f69fbd874---42040907658.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/19251374437.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/52087e62fc7b232d3df655d4992f2549/mosopugi.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3bd0606368ac42bd4709ea79e11fbb7d/5876694915.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609b992a8d9ca---84710704524.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/87685416851.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1623236635.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/28949068177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=deferred+vat+on+importsPDF 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_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 16708 bytes
SHA-256: 7cc528b8da2176e56f9b5486f2d800dab356ee3a90d75a5e0a78bcc6a3eed17a
font_01_sfnt_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 10680 bytes
SHA-256: 63b7b61df9fdf7f730469c9710b78b6d9b157627ef202246feb248c46a71ccad
font_02_sfnt_off00013515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1