Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e8c454d0bc1bdd…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 13:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30a05734850e0115a2edec262594324c SHA-1: 5fa5454700be386ce3c2a36c4c142ffdec96da03 SHA-256: d6e8c454d0bc1bdd70ad8b46ec52d913090041e85696681df2eab6e32c97aefc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://songuryazilim.com/calisma2/files/uploads/wupolunevi.pdf In PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a19a5c0ca---27187038442.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/65471786396.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7c492d0314aaa98797b703afbe13ebec/84928653391.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2b2bdbe2c8ac3e23f78e98b1065314d6/78476542656.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/7f0ff1aa411ccedd0c2afc168ada5a4b/talepajatideso.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8895e9bb3d544645fbc91f4f8ccd4829/93564360642.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/de3d5bdbb2a9a87f25c853336f0659c2/wafisirumu.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/42513565708.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/xazabi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b718ad945fa---89573456844.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160892a9756eba---tubusufoburaruriteba.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/62881527774.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/8318628082.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/xalija.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/40499444845.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/gubipo.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/gaxupazinopolomire.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/sopurinaserewozo.pdfIn PDF document text
    • https://bursac.net/userfiles/file/74728738820.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210708_124425.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/91054776950.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bea745bf78---1394274888.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/31785288616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=que+es+el+constructivismo+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_off0000d008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 17500 bytes
SHA-256: c31c10a1a7c32bfbba9e657dd045bd854f71b68da2718e869604951b35c3433b
font_02_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 10844 bytes
SHA-256: 56b657e5e1e0a4b37edb6e2b440ca04567d880a8c868378eb81faaca615c4d20

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