Malicious PDF — malware analysis report

Static analysis result for SHA-256 634c930e0418e0e0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 22:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c0107f335f408102082a4d0bb7fa7ff SHA-1: f2d24257f989f9fc9db20d772c5237cc94a332b9 SHA-256: 634c930e0418e0e0e67711af864ba32ce1c1a4e0a51d0d798125cc070b302bea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=android+visually+impaired+settings
    • http://xetaihyundai.net/upload/files/80677402368.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305b5083022---41820623137.pdf
    • http://erfaspot.com/resimler/files/teriregevemamejuji.pdf
    • http://versobrokers.eu/userfiles/files/60811633769.pdf
    • http://yey.uw52.com/upload/files/96456425895.pdf
    • http://files.ibiza-ferien.de/file/mofuwulelasipev.pdf
    • http://vekosgroup.ru/userfiles/file/punoxelidixaladegipevume.pdf
    • http://ensky-chemical.com/upload/files/zuxegodag.pdf
    • https://firesystem.ro/imagini_ws/83411783713.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b706851d4c---39159802795.pdf
    • http://autoscuolauniversale.it/userfiles/files/jisutobeparexoj.pdf
    • https://bunianco.com/other_files/File/67464169936.pdf
    • http://fields-on-earth.com/images/blog/file/23751147668.pdf
    • https://812423.qqtogeljackpot2.com/contents/files/fetawusasanavalusimad.pdf
    • http://dongkoo.com/uploads/editor/files/15678099064.pdf
    • http://dierenwinkelindex.nl/images/uploads/44870722074.pdf
    • http://vijyaiprismcrm.com/userfiles/files/11707862661.pdf
    • https://tomas-music.com/contents/files/73228321965.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d229af2a6---fefak.pdf
    • https://reclamesticker.nl/images/uploads/file/
    • http://mini-garden.ru/userfiles/file/73531636839.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12d.bin
b765dea4c07e96d6283c1731e61bca5fdadbe8a80a9578ca2dfb358562d209c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 17560 bytes
font_01_sfnt_off00010dea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 16792 bytes
font_02_sfnt_off00012601.bin
c52c0631a3900a6d0eeb227384c1ca434d2071dccc305c429171dc825834a08c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12601 10996 bytes

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