Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e3c7ada2a65547…

MALICIOUS

PDF

95.5 KB Created: 2021-06-25 16:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0e823ff2ab5957f6635c535747da3072 SHA-1: 4ceb49b9c8e3ecf7ccc9883d26889f22e4865300 SHA-256: a1e3c7ada2a655479d85a9b8e70b37851dd132819f6d8166d4e3e4957e5d12a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure points to a link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=class+10th+history+chapter+1+notes+pdf PDF link annotation
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/6702d7f2d2a9c3e3664832f4023636f7/bulilarabofoj.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f0324ecf---8011622453.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/lomenokasawurebufulisep.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/buvalaramabimekenumig.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/058ef1ab932b51d82a2093d083704878/15773802031.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b3021e3f2f6dcadc35a013fd799f2162/sidejim.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/03b79856d84991886a6731d85c16218a/32909036677.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02e6281537---54179731192.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/92218458757.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/detufibesusawinemi.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6a5949bb599cb1aaa9aa7ab591504ae0/65989778424.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/todifarezaxunulamagoguvi.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/tifoke.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021060621181473499.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb257eb01---gizasudopexoburobusulojob.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/42emaqlonvhcoq0ca2tr35qh30/lobinosunolafog.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/57699599224.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 16228 bytes
SHA-256: b7accf23f093e103e3bf53a156a1b3bf6b70919cbd16747e9070589bf0176519
font_01_sfnt_off00010fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE3 11036 bytes
SHA-256: db9d69bd2cd548e979a8d5400041ecf0ba467c0b59f63af4925753bf9543e7a0
font_02_sfnt_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000141ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AC 17444 bytes
SHA-256: 7e7bafb98bcd0ab1b39004f27f80fa6946383ba8b8e86a250e0a7202fa7d31a7