Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f353b040e6062d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 09:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84c8265915e8e8bde60278af35ae6a73 SHA-1: e839e154b55da8b87b3dbff175486e2cbad01d57 SHA-256: 83f353b040e6062d0f6509fb0d3ad69a4af9daaf054f5fb2df345aecec018219
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 as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a link farm attack pattern designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of disposable hosting reinforce this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da648b283e---44285774726.pdf In PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/tifosafukinigezik.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/74531524225.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/r4f7j2f8b7fd67tl9mas5er20f/kekixupuvinedap.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff52f651b19---35697210769.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/denavi.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/87451493054.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/rsr8bsec3hce1jqpe5ud1dl567/lumerow.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/48466799313.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/30280164236.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096ae61d1960---riravivapolebezemofopezaf.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/6e48601e7775e018755448249e73ae80/dumiwuba.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/gosinizavuzedikiwugo.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/25988618654.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/67896161344.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/xogipomofikuginekugeb.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e9bc3d104b7d91788d5161b7f5ee5e5e/rodejofezos.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/31t1lfpao8sv1tsdr1tlib837i/69897979943.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/omkb9u0ctvgtu8a1qaus16d0ad/fitesilazipa.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d556bc4c3ca---wupitafoluwid.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/560716499.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f83876909e4545871591cb28a30e2c27/gawak.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vmesn9qouse1o5gf08pebj8jt5/66731651935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=intrusion+detection+system+in+cyber+securityPDF 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_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 17372 bytes
SHA-256: b572b083259f90d932031201db68425227bf885da8c789f6b9a0fff83ca948fe
font_01_sfnt_off00010b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 10628 bytes
SHA-256: c5880b40c7ce9ae56a88f24eaf68cdd54c2fd98da9ccfbc0b600bf3fce361b4c
font_02_sfnt_off0001235c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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