Malicious PDF — malware analysis report

Static analysis result for SHA-256 7909ce3a15f17b4e…

MALICIOUS

PDF

93.6 KB Created: 2021-07-08 05:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7aa839c29e59aea6267aaeadabe74ef1 SHA-1: b307ed1a47712e29f98541a647ac326c60e25e57 SHA-256: 7909ce3a15f17b4ea4f3fa831d813592b73234fcd41da6d4c63ec62b4551fb71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites likely serve as staging grounds for further malicious payloads or phishing content, exploiting users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://laborke.ru/uplcv?utm_term=cook+macaroni+in+rice+cooker PDF link annotation
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160aa15b9eefb7---18204506396.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/43baed20cb9e86fb6f64fbb87643849b/93187462116.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df895dd0f0---rizajutuv.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79c3632da2---zovigisixi.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8b48a903f3dde0f8c150fa13fb0a48cc/96236137739.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ufei81hl00qovashl4rjlptkk0/70937469061.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4b4353d54---pegaxevafavegego.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/5cb4a98b236cbde232ec2dd9966d6b9f/30949204704.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/38add00ebc9ffeac488e340ff90b6552/xiregikigesarofutoxepig.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/30060347510.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3vf14frdsg5h1adsd9bfaierjl/lukodugos.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160744bdf7c24c---maselojuruminebipemozujip.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/17744931443.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/xasatixolaxufaselipuxuli.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b7520309666760cfa69571c84428994f/89976558593.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/takogakavipureda.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/eo27iuacv2j3nis2oltpa76qnt/62114005088.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8caef7e27f99eee8cf7137bc16c9595a/8423912466.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/kurilo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/367382c1e57fd82398a9b697bebfff04/46388760892.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/waxunosaba.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160e077407644a---68897819019.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/368b3683518a9b7fe9df5737bf904b41/5666339358.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/vofop.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609859f038292---mepad.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/cpujhmvo76sds88v5a47n80h5d/92948619398.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014abe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14ABE 18120 bytes
SHA-256: f5e7a775f0aa45ef21064ad14933ce79c0feb5c2d2a2acb6134ecb742fcf6a14
font_00_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 10204 bytes
SHA-256: d8473ad6306541e4daeffe32ae68b4e3a737ace9b89b580b58ad13014f14bb7d
font_01_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 17036 bytes
SHA-256: fa089cf8af9581ea7821eb59f2b41418039f02e040abd04e641a244ca2ac8025

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