Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd73eca6da0f2d7…

MALICIOUS

PDF

96.0 KB Created: 2021-07-02 14:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1e243d85dccc605216c0a508351dea9 SHA-1: bca03d98a64907c4c50f0826fbcd9c5eefdba403 SHA-256: 0dd73eca6da0f2d7f77c6d285cd412929fe7f3ab29b9120fa6c2a56a3813e588
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised CMS upload directories and disposable hosting suggests a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e6f102378af51e861f6d8fcb4cd5d809/palidomatonojosezesabe.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/86a694e5cf91b3eeb62fef1c1c1090fb/damowibevijeganisirarazij.pdf
    • https://butchercurnow.com/img/shop//contents/xopeleziwolepewasazidap.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d403e23ea1.pdf
    • http://omak1968.com/clients/71178/File/82465878379.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091f958bf24f---47773676573.pdf
    • http://exito-opakowania.pl/userfiles/file/85109082429.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608467987d11a---kofolutikotuz.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/3b9e35de1a7463371993b5c50defd60d/48781988356.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/nf40so8vpu2qv2iee0krj45h32/puzepefemufi.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077af4c05be3---fuxakirebudebisid.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8279680770---23528359319.pdf
    • http://reicar.dk/userfiles/file/24499786866.pdf
    • https://burgas-remonti.com/userfiles/file/99447859566.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/016499fbe77a4b75111c73c4774613e1/17153506372.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607472fc98be8---xalozapepa.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d18e2ced5---vajapafibiwazogupep.pdf
    • http://ya-ke.cn/admin/upload/57016133247.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ef0a83a0f94b29068dd57f9157dded89/74429542264.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da8a831e2cf---jewefamivubufalizi.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a457f330c05---22735219429.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/vuxexofumezivadepizi.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2fsrd4ltnon9bkh71pdhlcj8af/bomojodo.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4969636739---40786132801.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082693581e52---todesimopudogerozuzegipik.pdf
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/89846714511.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=managerial+interview+questions+and+answers
    • 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_off000112d1.bin
ba2761c24c5eef2608d7b19d2335879cead59c51415d5cc2e36a0a9008c8d793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 10816 bytes
font_01_sfnt_off00012b6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6B 16792 bytes
font_02_sfnt_off0001437d.bin
fbb89f52d6edc2c829b8eb6c33ade0404da17b311566d31f4313a03617cfb24b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1437D 17792 bytes

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