Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bb6d5b42bec505…

MALICIOUS

PDF

84.0 KB Created: 2021-07-22 01:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9b2fe216a174c6e0f64bf17849d435b SHA-1: 9d3611d6880bc6ebfb0f7fa828701bb7dfe1ff54 SHA-256: c2bb6d5b42bec505d2431cd340924b2e0354ed1a70a0dea6642e80da0ea44b25
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. Heuristics indicate this is a link farm designed to obscure the true destination, and ClamAV detection confirms its malicious nature, specifically flagging it as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to click on these links, likely leading to phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7e2bbfe87---57204333578.pdf In PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/43838290089.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd79784b8d---xodititufabajetefijemaduj.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/sidupokejexoperemadipej.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/87075224269.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075138078eca---30539709548.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/sapizojoton.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57b7b6c73---31642856486.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608073e58b8dd---matelilotokapefan.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/61445534186.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789070f109a---pegagobopanutoparinineti.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/liwen.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/301c960602cb788dc0957ab908ea75cd/garodozi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54f56763c41b384b0f2182ff44023a12/rijunogakiriduxup.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/sorejiko.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16090eb8ae0e99---39781805659.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a1a96c0a4---xozikelegesixojubusijopo.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/47318472911.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/9210086190.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b413c04f22---75241640109.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/29776041273.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/7lhoj1ugpa9hoik3tnkhhrgbg0/raribifuzowinofawoxovu.pdfIn PDF document text
    • http://shophouse.info/images/files/xamul.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6542a438ae---xirizojopujuselawowelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=it+is+contractionPDF 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_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 17792 bytes
SHA-256: 14608eeb094b5a3428b166b567b04a88c181d94f1a9f04470daf9e0746df2097
font_01_sfnt_off0001140d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C23 9996 bytes
SHA-256: f879e3a50ec948a5d8c42c33822095c135bd75c82d8ad87f8ffa5490ec070b5f