Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff200bb65133ea29…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 22:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b055b174ede1d4029a01d69036b8324 SHA-1: 7814e3956d60cd6885b5ee85f16fb1bb656bfe2f SHA-256: ff200bb65133ea29709269cb7d30e711b902597da2a767836600b7e83847357e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vzwsportenmuziek.com/content_docs/70721061737.pdf
    • http://biondiairsystem.it/userfiles/files/44120040984.pdf
    • https://pilisilovaskert.hu/ckfinder/userfiles/files/95426126398.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46036302927.pdf
    • http://aroma-es.site/yamituki-n/uploads/files/84649365262.pdf
    • https://aspirans.com/files/file/jusonupiginenu.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820af6884e2---kavav.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/44842383653.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/muxafajulurifalasokowo.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075b8f03909f---94434902671.pdf
    • https://pearproperties.in/userfiles/file/bujofidexepanumej.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8259dadd8---mexupukeritegoz.pdf
    • http://madinagirls.com/easydo%20v2.00/files/uploads/fubulejit.pdf
    • http://lamorenj.com/userfiles/file/74232394658.pdf
    • http://loaamtran.vn/files/usersfiles/files/tirolenotegukopigimisut.pdf
    • http://handinks.com/ckfinder/images_store/files/rufotirogoxabit.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/livisinis.pdf
    • http://derkwoo.com/upload/editor/files/pemexi.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160acea02b66e6---27008625963.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf41170218---7324395749.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/5199604876.pdf
    • https://easypayindia.in/userfiles/file/53704925891.pdf
    • http://osmed.cz/app/webroot/files/files/piparikaku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=micrologix+800+user+manual
    • 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_off0000e320.bin
5848139cb5dafcdb4510e6d43653c0f55432e2e1af5087b225123a6ecd91b78a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 11000 bytes
font_01_sfnt_off0000fcb5.bin
e46029555f224890407998f8e7977690fd477ce112ac02ce42538e01444607da
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 17944 bytes
font_02_sfnt_off00012b8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8A 16792 bytes