Malicious PDF — malware analysis report

Static analysis result for SHA-256 06fa73bbeed23f5f…

MALICIOUS

PDF

87.0 KB Created: 2021-07-23 10:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39941797889e093cd48fe510c59b1f0c SHA-1: 48c46c133bef06923efc821c9e8d1abc02eb77ae SHA-256: 06fa73bbeed23f5fa67b6b4e865b8d836876503248c2aaf9eac13c301c9a3f79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to manipulate search engine results or lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://tecnicadovolante.com/images/file/dibedenumuxotivuwasuguxu.pdf In PDF document text
    • http://bsa.by/ckfinder/userfiles/files/43086518525.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/62009005555.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/16477137495.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/fb8d2743a039191367190c77e5867fe6/zidagifuvixovofenapet.pdfIn PDF document text
    • http://myphamasia.net/upload/files/58615039927.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/tazigafib.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076c7a9e0af2---81556424899.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4ffbe961b9dfee4985ef7827d7936017/89729871459.pdfIn PDF document text
    • http://fygl.net/uploads/file/121412506425.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210617_030152.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/kjlv73j076vikhnu7bjh0ubukd/44731973094.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/pjrcqcrjcoe7gvd2v4ijcf1te0/92470857945.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5f4a539e89cbd83fdeecbd2dfce6ac6f/13063437639.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/gigopizon.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/fonudivew.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162645202371893249169.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/65334150262.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/50712241740.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/depenuda.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e3b507dfa---wedumivuvizevasosadaniteg.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7aakmiu6tuk86tdue4p6qif9h8/87105789726.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7d0cd9ae---lupobudatuzera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ground+state+electron+configuration+of+ni2%2BPDF 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_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 10912 bytes
SHA-256: 1d9fefa32d4e7effcda36f23d9b6d1b4296f4140579e44a345f8db3b0236d29f
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 19160 bytes
SHA-256: aeb678d3cc46b17c2a7ba4fe13ffe977f66fc32b620418ec7b167372a43f031f

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