Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2905c2dc9b825b2…

MALICIOUS

PDF

89.3 KB Created: 2021-07-20 03:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3befe9d725c20569288de7a0fbca34fd SHA-1: e109cc8c786ea8910b60e89d785dce036dde33fb SHA-256: d2905c2dc9b825b20fe4c223cd9570aa9c58bbfff017576de2273d5d3b532ad8
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/bhqv5u583v2j7aoailf8ip0082/kotegodadigetumor.pdf In PDF document text
    • http://eia-edu.com/userfiles/file/jelesadopenitez.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5fc604da---femujor.pdfIn PDF document text
    • http://ashioke.com/images/library/File/terajadijifa.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/5247430788.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/kixejepodotomanomopo.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/79586337632.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/76432e3d6f79f6ad04fa82a48d5eb02b/getitaledelixosizeru.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ccada7863---74779064514.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/52ph54gvgojj4ka3c48kvl71ct/75007524485.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0d709b3b59ada355c0069f24cdf22742/55657524605.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/14707036575.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/kogunixavuwafigevuposebes.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/febiwisuxuf.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/66721343196.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d08b89ad8aa---dotuxuvenexazek.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/43907558487.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/wowizeribisaginisaz.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/v6jkrl3rpjutmmi1es7coprmpt/lenudituvixoweko.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f882bea93e---7587120888.pdfIn PDF document text
    • http://apple888.vn/luutru/files/botisolutegoga.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/mafijexasopilad.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a89cc9f00---megipobavi.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/95227776969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+tame+polar+bears+in+minecraftPDF 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_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 10860 bytes
SHA-256: ff9b03d6a15cdf5478c884ddacacce9cedf7cce577504a6a7b05dc90f77db90f
font_02_sfnt_off00012995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12995 17544 bytes
SHA-256: 2daef26b13ec60728c39cd667b18502479b1593fb3cd11e44a293555d16ac359

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