Malicious PDF — malware analysis report

Static analysis result for SHA-256 43243ece1ea93d4a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-08 11:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e544478665f4da8e3e05fafd4d0bd7a5 SHA-1: 21f97163fc8fb5ffe1fa61c3663dee3062f8c87a SHA-256: 43243ece1ea93d4ae38900d783f07ec753fc70a75157bee0b09d7125704e11f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically identifying the pattern. While no scripts were directly extracted, the structure suggests it's a lure document, likely intended to deliver a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c9234f31775---wefiniporenajeg.pdf In PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e87a91d321---16292018493.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a3fd35db9beb7ba3158c6c7af862739c/43557905752.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/69957807715.pdfIn PDF document text
    • http://phunhai.net/upload/files/37825167063.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/belonijew.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160707a502b3f9---lijavogilaxixawanemuzidi.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9e91158be---nurokid.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a28adc50d---fumoputunomid.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcab19c3a54---65627100860.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d54d0900366---2014887435.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/bulikukilutobisobipa.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/728424831.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb51a7b10---lipojaxijezopoxegas.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/0696b6346fc2d8ca7c0a46581334c783/42201129101.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/12371306602.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/zugojigewojatulapok.pdfIn PDF document text
    • https://fishboat.hr/files/15010652878.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2cf204d819a08401179219a2621787f5/pimiwesami.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/xaluwaxi.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/gisuba.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/mabaladuxofisizaf.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/57620aaf21cbe3befdc90068c2291fd1/61851799623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sample+rationale+of+the+study+pdfPDF 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_off0000b273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8A 11052 bytes
SHA-256: b0ed67ac210139ff23ab80e4a365a24ce47816c59155ea1610ebe55dd96f9db6
font_02_sfnt_off0000e409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE409 15360 bytes
SHA-256: f82c3e5bc99c8da3c48454488fc0774fbcd983e90666aff1e6323c19e83248df

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