Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4cdb5461fb587c…

MALICIOUS

PDF

71.8 KB Created: 2021-09-07 23:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5afdda8a2f55d20e0996aac32eeed4cd SHA-1: 275ce514e63d5dc227c5512159d9e07e300b0850 SHA-256: ac4cdb5461fb587ca45311feaccf5894f90a1e0c1f1b1d9e41d7e3a03d04a505
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links pointing to various websites, many of which appear to be compromised WordPress installations. The heuristic PDF_RANDOM_URL_LINK specifically flags a link to an algorithmically-generated URL, suggesting an attempt to host malicious content or phishing pages. The presence of these links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=hach+colorimeter+manual PDF link annotation
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ba65f034845---92889357609.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/43jsrudfg9m5tgeck35jnp50q6/10658836487.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/be91b6c30eae9c3b34062fb8a6be000a/bukenapidotage.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/1535574136.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b53c1b5a9---dusekadegogolikex.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/butufudunirifesefe.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdaf830d44---89330950518.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac4aa80a3---kokerurule.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/79mr4m58b3lj0mqg1o49vn550r/39884192215.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/58152045563.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/65713330803.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e937cb41e53---57951608373.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/fc3953dbafaecba262c030b6f4e295dc/19254954218.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0e48e9395---86337971090.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hjar2tqqqb4brmdbrf944sifl1/nuwarigajatokejobupufiw.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/puvusuwofobubafil.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/tilewixawidepupobavusu.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/rizuw.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/zodatefiwewibomar.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab68eaf1561---65506690587.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/xaduzazovonewatewibe.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_off0000b59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAE 17520 bytes
SHA-256: 87bf358a5bbf88959b9c8a2bab62d881ec1d6dde5c514d138a3ff5292d0ca05c
font_02_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 10416 bytes
SHA-256: aba3a6467a871231fd7b301db42689b7fd62fd961fa4630b6e19c51f7106c2c0

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