Malicious PDF — malware analysis report

Static analysis result for SHA-256 6adf356b1e4cc3db…

MALICIOUS

PDF

133.7 KB Created: 2021-09-05 20:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8de35668459c4b4c381f0f39e586ca22 SHA-1: 5369f6b4e0272ea035a2ee792d131ee01ccc28a5 SHA-256: 6adf356b1e4cc3db7e3516ad538af1583afd1995fbaff6000400c5c0e8e1c505
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://coretry.ru/uplcv?utm_term=bewitched+and+bewildered+book+1+pdf PDF link annotation
    • http://vinacafe-dalat.com/Images_upload/files/51150866911.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd44f2c88f7---3679126415.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/127d9d58e9e387327365923e0a0f7b74/27663993927.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/0cc318f29e9ef82f0c7c8c7e163a777b/sazurebevotu.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/90387396720.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/86628625260.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/befirukufudavifopoje.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/tometanotilomogisabimo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b449daa909fd8f0b04948fea42af82d1/ruzanimuleze.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/105771df2bee4c38c4dad5ad66be8f01/sowiduxaxarubakisopa.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/dividezur.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd026deb870---razimirevajivitoxozor.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/nekixamigiponowuxeropika.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160784955a4365---49249714122.pdfIn PDF document text
    • http://kme-kme.cz/files/file/76368953110.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/filor.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/7d5bc39cd88e1efc105d3ad97844b262/rerizamemezu.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/85470100377.pdfIn PDF document text
    • http://runo34.ru/attachments/file/zuvawurosoz.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6ce65dad7---19764301261.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/sizegenenal.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d3553420abcd1b0a5a929658e7743368/pexov.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_off0001a971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A971 10972 bytes
SHA-256: a2304c4c30db2f8c79265bb0157179b59abe7286fedac68cf74dc714003b91f3
font_01_sfnt_off0001c2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2B9 17984 bytes
SHA-256: 4007f86d13b89584adedefee2d5c2b86d67909ce6ddc469b7dbec9d37b5788a3
font_02_sfnt_off0001f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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