Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdb16ba42cf268e…

MALICIOUS

PDF

84.5 KB Created: 2021-07-10 01:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34ce5e17311bf8457eb600f4ff5a64a7 SHA-1: cebdc4c53bae02d77fbd4e041280203c41cdf1b5 SHA-256: bfdb16ba42cf268ef6de1afbfe05c647470215dc77a56794ba00f3ce7cfc1baf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d948e93c655---81405416473.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/98f8a57d82e3d84d5bcf5289c9335355/27870841285.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91430e06ae365b5d2b3b445706f0cf21/tokunubeji.pdf
    • https://moolans.com/uploads/files/xibitawujarus.pdf
    • http://mistral-paints.cz/userfiles/files/towetew.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d13bd511---85910676028.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775a0f78e35---josojenapapelikozasin.pdf
    • http://myflora888.com/ck_files/files/40094616866.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ca8cbedcf5591c233939a21e1b28f9a4/patemuwumow.pdf
    • https://leosservices.com/userfiles/file/89066809959.pdf
    • https://carsen.sk/editor_uploads/system/files/tanibizisiritere.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2ba7834d2---kijodi.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e44f37572---37405264556.pdf
    • http://chinoboxingclub.com/clients/36032/File/88922012227.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160732ab90c1e5---tawogamoxupuxipedi.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1c5eaac74cd93ba7c7245248b5914def/92769232530.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fa259e951---34240128368.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/veluratobikapifasuj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=internet+download+manager+download+free+with+serial+number
    • 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_off0000e62b.bin
0c341b1b6621fca6e5d76e8c7bf6d931e4a9b58216c10a666967096d1156a818
pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 17096 bytes
font_01_sfnt_off000112fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 16792 bytes
font_02_sfnt_off00012b12.bin
e952a1d9076682bde9918c69e84c24e4796ae71e89576a2822fd8761b082ce2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B12 11080 bytes