Malicious PDF — malware analysis report

Static analysis result for SHA-256 84688211a2fb0eb2…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 20:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c79f5fc13c2c51838d8209ae9945f2ef SHA-1: f764c901410c151586f14b86a746b9c9107b5d77 SHA-256: 84688211a2fb0eb2f2a24fba6dad8a4d1101e260b4362e1046e480a8ac01ac6e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using link farms on disposable hosting, often employed for SEO poisoning or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=introduction+to+statistics+by+walpole+3rd+edition+solution+manual+pdf PDF link annotation
    • https://eastmanllc.com/ckfinder/userfiles/files/19250183291.pdfIn PDF document text
    • http://asid.rw/userfiles/file/72685482.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614321fc8166b---48291194704.pdfIn PDF document text
    • http://armanetti.com/images/vogavezopepudenedela.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/nixamabojozeze.pdfIn PDF document text
    • https://rjpexport.com/files/80094714049.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/mipopaso.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/32403975074.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/11678400111.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/wexupikawowiluw.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/53371496937.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d7771314a8c59c1663ec96a50d8fc4f8/95947009474.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/jogadevuwikutili.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/wusof.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/21582481561.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/76681543766.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/babofabagavanarejajamizok.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/datepudepema.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/fogixoradudiligosim.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/kovuwiwofowisotetineju.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/nttq344trqej6k9eeifvgql4u2/xigezipamu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/297523c87b5f1cd5ba54c52e351aaa1a/kerugevani.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161303ab2029f4---sorono.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/3490131076.pdfIn PDF document text
    • 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_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 11344 bytes
SHA-256: 8084b23dd91ff80f5ba56e90481098f21d27290b3f23a460de3521e3abb120ae
font_01_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 18936 bytes
SHA-256: 2fbd674852ea86c10a7e6e5d9e1840dfbe611acfe986123a34138b5e5601f6b8
font_02_sfnt_off000124d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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