Malicious PDF — malware analysis report

Static analysis result for SHA-256 af538346eac2bfc1…

MALICIOUS

PDF

82.6 KB Created: 2021-07-22 20:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e49ee76ab642ad596d76b047d965a476 SHA-1: f101c67eb76c1258e1905af35ce0bc04dfcfbad7 SHA-256: af538346eac2bfc1f7f1b71ba52bac95432393e52734f153195bdef9c5c4b7c1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised or disposable domains. The primary purpose appears to be phishing or distributing further malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bahia-group.com/ckfinder/userfiles/files/33000629624.pdf
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/sanarinezujapad.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ed278bee7d726d31cbd4a0606322b86a/jezik.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/31108e7b3c8ab215d0c791be03a9574a/16228872795.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec5d63c8aa---lufejawugozejigivagum.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d62ee56a---96665369103.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba016226203---vexevamifuzinolosikugo.pdf
    • http://riverside-plaza.com/upload/userfile/files/63014600409.pdf
    • http://scouttautomotive.com/editor_uploads/system/files/50703670617.pdf
    • https://fo-prefectures.com/pages/files/magewowemojufilo.pdf
    • https://paroles-vives.com/ckfinder/userfiles/files/95785575925.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/661861c5649397ad1f8f77c4ed52b813/legawokabilizof.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b838922c6b1---12460777231.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/bb5d3a09c7b1efa2f59bdea6519cbd43/24521264687.pdf
    • http://whewfamily.com/clients/12004/File/39352607696.pdf
    • http://bakoca.hu/files/file/bitusiwawesasaw.pdf
    • http://archinfo.ru/uploads/file/tubowifidewegezap.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/d747cc48db897dad96b6c246b2b811b9/vefepaxilegax.pdf
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/xilamovarofosamuxovit.pdf
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/vuvarofemopolovevudilita.pdf
    • http://3xlove.com/uploadfile/file/teriloletipuxedasugebuxuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=eniac+computer+images
    • 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_off0000e0d6.bin
598ec845b621a61778e2212f80dfeeaee78caa44a8a6cc887df04d5d99c12167
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 10756 bytes
font_01_sfnt_off0000f995.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 16792 bytes
font_02_sfnt_off000111a7.bin
5f2be223785ecd4d7d79dfe6c5548031ed13f560d35ccb8473fa9e7cc96068e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 16772 bytes