Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeffbbdef941e5f6…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 05:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b87e697698066b5cf4ead60b6422ec13 SHA-1: 81e56bb109b39c84a5ed3c2f240a08bb0c5fe09e SHA-256: aeffbbdef941e5f6eb17b73520831ca84522249096b21e9ae62b8bc0334813cc
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--aknmedcal-wpbe.com/uploads/file/zuvifanefizu.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc5fba5d3---zilazeremolajugizufaxedi.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608f667ede66b---32852360650.pdf
    • https://balaji-technology.com/userfiles/file/mivufusorawotanafarunene.pdf
    • https://mobilieroccasion.fr/uploads/file/85950063287.pdf
    • http://intrinhgia.com/admin/webroot/upload/image/files/luvun.pdf
    • http://babyindex.nl/images/uploads/waxotijigokasobopel.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5ed5054f44afe01f8bceeef993a7a075/56117491959.pdf
    • https://getracemirates.com/userfiles/files/94882819909.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d43c323e823726f68ecb55e2ea85e0eb/51435438987.pdf
    • http://goldnumber.info/userfiles/file/tozegavituv.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6h8honkb5bpdv58a4ddou750d2/52222326131.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160794a217c5f1---16641781145.pdf
    • http://mospolytech.ru/storage//files/93261988919.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b63aa90b2e6---6963924209.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c984985dfd9---rexuvedimi.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94e4c2e551---jitipakul.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/375c965a2e0d9ee94c0861bd5150fcf0/xaguvusubitovovifuwelo.pdf
    • http://bogelaipigeon.com/upload/file/jakaxojujixegup.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608763c45427e---xoporafafeb.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/h6suifumj3neg45fav8a8sbnl4/gibazanodato.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b214996e938---nasazubiteze.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c90dd746b4c---bozuxazivezujodexuwagov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=easy+christmas+crossword+puzzles+printable
    • 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_off0000e9d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 16792 bytes
font_01_sfnt_off000101e9.bin
0c42a2c03757d675513488b45b8abf325ebaf4cbd7291634bd78fcf5e247d17e
pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 17228 bytes
font_02_sfnt_off00012ec4.bin
41e1de0c7ecf262918464386240f6a48ae7104b13d160f14420f8b48cea2ca57
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC4 11264 bytes