Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db822bd26a00596…

MALICIOUS

PDF

131.0 KB Created: 2021-06-28 05:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e431b85d8c5d189d285c02298a85f0d5 SHA-1: cb2351ea9218d2850e68f96a1557ed6ca0f8d017 SHA-256: 6db822bd26a0059686a2686b8579e3b097ad9c59fc927109537768442419b620
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and external detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://sl-light.ru/design/img/upload/file/xabetururu.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dfa05cca5---fisijozuwipirop.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160965fb60a774---10265393494.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/fl9806a0jlp52jdptpkjqqadg1/25842560637.pdf
    • https://havanic.com/cache/fck_files/file/ropuxujutujoruxunakeze.pdf
    • http://toshiteriyakiburien.com/uploads/files/tonojepadadegojafidu.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503094822969886.pdf
    • https://caribemed.com/userfiles/file/lesumivarejum.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/80149379469.pdf
    • http://tfh-filter.hu/_user/file/23705786389.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/fcac416a53e849485d3764f03c91c507/83301522092.pdf
    • http://breakevenpoint.pl/uploads/editor/file/8763623737.pdf
    • https://guapa2.com/admin/fck/file/dopetibebo.pdf
    • https://people11people.gr/uploads/File/87819709066.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ca8343990a255708a6a59e919bf21b5e/12797328646.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b1967d66a---89007072491.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22a0d8645---98975157909.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/l80olrfnqtdue2etvgdrth6975/40021787965.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9107227e00---56512050834.pdf
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/47422479904.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a12a3f9c438---kekigutoxezesokajamopikab.pdf
    • http://liyangah.com/Upload/file/pomapofuzidulefek.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=smile+in+your+heart+ukulele+chords
    • 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_off00019b9a.bin
536c1bd21f223f56e88d3c979d6f94ae5d905541fc4f1fb07f9171b0c66f972d
pdf-font-stream PDF embedded font (sfnt) at offset 0x19B9A 18716 bytes
font_01_sfnt_off0001cd6d.bin
241c71eca2dec7272bcaa678304ffb35e359407b4b9b934cd3504fee2d60d66a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD6D 11016 bytes
font_02_sfnt_off0001e6d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6D5 16792 bytes