Malicious PDF — malware analysis report

Static analysis result for SHA-256 276f20bc3b05f6b1…

MALICIOUS

PDF

79.3 KB Created: 2021-09-02 21:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6bd30890b6e69366bae3856d694e185 SHA-1: 3d961e3283418b10de7d9b3fa5b3addf8500f3b8 SHA-256: 276f20bc3b05f6b1c7fc3f7e4f6648ccc65d70a2ab6d09564df38f3041e704b0
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The presence of a 'download button' lure suggests a phishing or social engineering tactic to trick users into downloading further malicious content. While no scripts were directly extracted, the overall structure and URL patterns are consistent with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=hesston+4600+parts+manual PDF link annotation
    • http://duancanhotot.com/upload/files/pumitodiluwovafab.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7e8e1b5b---rakeg.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/74774919613.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b4a037264---16919061438.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/navujotupukesawez.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077587fef824---79715117553.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d37785e8f68---wufadigu.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/lozev.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/93ce934bfc77b34a1f39919d531edb5a/betomidodatilo.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/letujilipubeniso.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/4ne62c6drv39gbbdckki0al7i2/sodawixarizu.pdfIn PDF document text
    • https://rintrans.com/files/baminanopujuxiwozuwiw.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/bobakanovoxopasazew.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ece613aa78f057d8a5769fb53ea8e131/70742672761.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-21/images/files/43259226069.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/38082434933.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939feb3e9f9---goviguf.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/mewurapurezewemi.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/52f570a8e207f606baec3c2ee90a6cfb/gemup.pdfIn PDF document text
    • https://badrivishal.com/media/rinimonaguj.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/kefamalunulugodima.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/96663611564.pdfIn PDF document text
    • http://webursitet.org/Files/file/ruturativadinu.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/91925347181.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 10780 bytes
SHA-256: 46da224b7b9b297ab991a75524e37830c4786199ebf4dfc26bdb8be27c8fcf56
font_02_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 16968 bytes
SHA-256: 97b635d0eaa56763476fec0bee4f2d48c2421358856eb85170150dc7022da74d

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