Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c18a3279a3ee646…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 13:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b17534ce8b4795a991b643de671b4a4 SHA-1: 4710f325535d8f4dc82c85078ddd48f57589a935 SHA-256: 3c18a3279a3ee64678541f6291688b371efa62deb1883419dd036c4c4e55099c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rugsinc.in/UserFiles/files/73644698807.pdf In PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/66358581228.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077899e5fd30---70245380124.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/97204676775.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/dusifidofidaxevusisaxis.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/86556520009.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210903140105_npdxbu.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/paxexuralesuxibag.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/85119548126.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/56488910616.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/1c5ed5c3823f091091499eb4b368b19a/66357590749.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/jasetibexexegolu.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/04677f6932493a12998bb87f89c68710/23326891633.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/lowozejopolosegopejegi.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/lodow.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16085767d46e6d---dagumelorewura.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/0f772qtk0o2c9s7s7jg0ljsjnf/55931645123.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/48753992073.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d19a9fe34---46183691857.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/57529999488.pdfIn PDF document text
    • http://kotolantopeni.cz/file/botobazesarekisep.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888f9b13466---puwenemedaga.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4425c3727---37884893235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tripitaka+books+pdf+free+downloadPDF 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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 20456 bytes
SHA-256: 0d9dd058e9acfa6517ba803598ecd957de9424e83d1363bee78d26a3c9e21f74
font_01_sfnt_off00010fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB8 10772 bytes
SHA-256: 62249473eb4bf876a949894d51ea06d9dd68cd0a45d16c3c740fd2df656ecb33
font_02_sfnt_off00012880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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