Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa01821bc218a5f…

MALICIOUS

PDF

89.6 KB Created: 2021-07-08 04:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 921eb23b78958fe6e5a0e0c0042bf346 SHA-1: eab8640e5a8134ddfbcdc89af47c0c6748feb360 SHA-256: caa01821bc218a5f173a052df0926820d71af400ea601ca294dc9339a3159e99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=oats+good+for+weight+gain
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb0e3af9f---3605398217.pdf
    • http://stark-tools.ru/images/uploaded/5803296804.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jvd6oj98d2dgogbsila2gt5jrr/parifalixeselete.pdf
    • http://roland-toys.eu/userfiles/file/fazowukuregu.pdf
    • http://asiancfea.org/userfiles/file/gufejigawerojud.pdf
    • http://ms-krmelin.cz/app/webroot/files/files/gofiteg.pdf
    • http://bensonlandscape.com/editorData/file/58014125880.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/53776336982.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/603aefba62885b98be333f86ac08ff70/siwezobu.pdf
    • http://salinasouth.com/clients/11073/File/80797223195.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/88b362e99438d2fa904230ef93e75a1a/79938484470.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7122a3d905---lewavodiju.pdf
    • http://canadanur.com/resimler/files/podatudikekelabaluzefup.pdf
    • http://cs-golfclub.com/ckupload/files/1950780000.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/270a56ad7b7e3f403af3b8f1d9fb67da/lufabitusekebozinepar.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/krs7sb8p4qm0rbb9mc6mbe80on/zuwavinopobaw.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/29613918027.pdf
    • http://digemnd.com/UserFiles/file/lusid.pdf
    • http://www.pattyn360.com/upload/forum/files/97455082284.pdf
    • https://duproject.com/uploadEditor/files/20511422354.pdf
    • http://lyzebrno.cz/userfiles/file/9534731929.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd31a5a2ba---99505015001.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/59482103043.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/19c3851a28b9b09bcce40ad9cda85aa2/duzinozowamoge.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_off0000f945.bin
4195a08b0e08d74bcb03c7b0f2955d09c0161d13cef55dec042b10dda1c98018
pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 17456 bytes
font_01_sfnt_off000126f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 16792 bytes
font_02_sfnt_off00013f08.bin
c8d0262f923daa6a0f7c4c8b81c9991797cb8e8e82cbc1d5008ae4bde027e474
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F08 10700 bytes