Malicious PDF — malware analysis report

Static analysis result for SHA-256 942b0754e0002e68…

MALICIOUS

PDF

90.9 KB Created: 2021-09-01 12:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 554ed146a7ff973d0b4803004aee516f SHA-1: 7b9147d9e652766dedaca08b6034d0d8122c0bde SHA-256: 942b0754e0002e684b3d80453123ff37b1f689068d47ca116b2d3338263b3125
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links to compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs, while numerous, do not contain explicit instructions or scripts, suggesting the primary attack vector is directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://xenang-mitsubishi.com/fckupload/file/xomekolizorinonavademusom.pdf In PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/m12v2l0mmuegimq36gqqf44sob/veduduwiresikilajaj.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/ritemetanurabubi.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/47730807780.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/h2g8e9n8mhguibb345n1lmstii/febotimapefedamiru.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94928403401.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/9bbb43957de0cb3dbcc598859d154b33/24080545635.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/8478745414.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a7eb4ade67d53f0d672aacbf8703fb33/85192839638.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/26161126254.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a296e9aeec1---89110352806.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/jo32fk69coipq5jddo9qbiaes0/21320203277.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/11250169607.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/87243309712.pdfIn PDF document text
    • https://fivetc.net/uploads/files/43040164183.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/52171132010.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c59c94431---94992574193.pdfIn PDF document text
    • https://badoza.net/userfiles/file/jopobaluxilomulejagum.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/tixabigirox.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/51829817261.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd935da9214---bidajiximedovemuzanug.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/s7h9fc7h8flkkhg2ug0ek71o3m/12407324707.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/dubixuxeriru.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/bebiwux.pdfIn PDF document text
    • http://harperfamilyreunion.net/clients/3/35/3566a42c83b0accea4ba2bdfee5c7976/File/45117617620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=seven+thousand+eight+hundredPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 10724 bytes
SHA-256: de4d8a4e10209ed62f524a911acd2d98dfbe006e4454133b5ab208565a8795ea
font_01_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 18904 bytes
SHA-256: b22ee3766479a75b8a18439a317d4d06a3b7fecc4b4b34541385ef3056673ef7
font_02_sfnt_off00014533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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