Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8513fb4c7da606c…

MALICIOUS

PDF

88.5 KB Created: 2021-07-22 23:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f5fc0917e10f698c70c96fcbdbd5c057 SHA-1: d830129ecd7eb806db6d277c8edfab7d83e370cf SHA-256: c8513fb4c7da606c18fb52de00e206c5bad59cbecbbee5121cc07b3266a3f730
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs are likely used to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/67154f01177970565a10d9e03735b003/xusefe.pdf In PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/71b7e959fae9231ca9459270e3185704/migofivutupazesi.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/18636749488.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/37317652618.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/88875947487.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/2a5104909fcc83b097304b6573802af0/siketuviwakokav.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d32fcd10926---zegedo.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160726c8ad2490---89072877097.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/14417180839.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0d3a841d396930e63c9c79571cf75434/58863713821.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2145e2e856---nasuvek.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/6b43d5201a2f3ef7eb36cb9ccc3d2777/tedamotoxurevezugasevatap.pdfIn PDF document text
    • https://menu2uplus.com/images/file/60172308344.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/fozanelo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0c94e6b16---zivolaxenulad.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae45b68c8fb---lolisupakojanajidilazo.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/takiviboludod.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8d08307d9---21242688034.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ea26073d8---fejojofuzifawum.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/livazaruwefej.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e81789b2633---gesorovubinexodinab.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/dapefubemiwof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=four+month+old+babyPDF 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_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001111a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111A 16908 bytes
SHA-256: 293a31e0230d4e54ab68bb6199af12d0a3dbbf534d009681e3c75c2215b38387
font_02_sfnt_off00013d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D00 10452 bytes
SHA-256: a14ca453155f96e1d7a7ad29bfc38caed6aba7b89ec16fb2253d49a62ab6365e

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