Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d887dcd6e27559d…

MALICIOUS

PDF

84.9 KB Created: 2021-07-01 13:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e32b532fe67e92ab6851c3a21f5f712e SHA-1: 6f5553dfa969bf6b72c1a9ef280d1378acfc8f4b SHA-256: 7d887dcd6e27559dd77bb5230f1f1dfda01a1b8b8887b2e8fcc49dd016becf46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves using deceptive links to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=preparing+a+resume+examples PDF link annotation
    • https://gregor-biffiger.ch/userfiles/file/11781023990.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c8951c787---titowugisegaw.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/zuwimogavuxeferoxodirupes.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9252abb0b---rixabamow.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753f165bf3c---28251376039.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b267d0b7f67---78703075581.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/d58425cb925d234975601e0bf1e694ce/20472593206.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/4e42ca7a081d4e54311cf105d530fa09/koribiji.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b89e5464d08---fenorunibarowemekezisobiw.pdfIn PDF document text
    • http://momsystem.ru/public/file/42371139372.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c156ef56670---61647668674.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/nevesu.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/79204801651.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/96316781352.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/1e9b4cc2a225cb8dbded891e7009dfa2/36966755231.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/pogojazarafugubixa.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216945567259.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aec5239c19b---71819378452.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/lofidunuropev.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5d304a6e1805ae7d96a509c40ef90f58/68216805942.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b548de2ba8---79163725409.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7aa36a8d2---36368857115.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5adb911564---lovipepedofogire.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79a54a932---4162564149.pdfIn PDF document text
    • http://centronegozi.com/public/tarerowudapi.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_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 10580 bytes
SHA-256: 4b3f616152211ee391777521fb3bb39d4b802e0442b069813d4a7d16337c8a26
font_01_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 16636 bytes
SHA-256: 1802bb352635727d770580e99b4040e7978cd28abcaa21b1f86e6cb96050fe0d
font_02_sfnt_off00012e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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