Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08849603f583c6a…

MALICIOUS

PDF

103.4 KB Created: 2021-09-06 00:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6dc7257183a83d52c6c7dcd179a58729 SHA-1: d32e66e516e8ae431189fe7ba3af64bf34b542bd SHA-256: c08849603f583c6a670d51ea39a4461cb30774b7e2b19bc06170877bfa5ed5da
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.tahi.hu/ckfinder/userfiles/files/1663789199.pdf In PDF document text
    • https://mecaniquekd.ca/upload/file/84555534580.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/1101818038.pdfIn PDF document text
    • http://vejwun.cz/images/lotuvasokofigepikigumu.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121e970a007b---41863279365.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/38357182457.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609086da6f016---tagavoboladimutolop.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ab92965ecf5eebce02f6e74f5cc07479/fofafib.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/19422036207.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be8ebbd0f1d---jaxisodevapegudikarivad.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/b840bb3ff6dd6cd606d96f756207a1eb/24187741842.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ih1addjlbsrl8m19hgckj2eth3/54903186260.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161216e583f536---tawidol.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafeb049b1e---zerepepevexegiseme.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/94478327409.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc9f0bcdf4---10838141747.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/99783508345.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/moxekidurof.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4ac278659715b88aeff1118b8bdab9d6/31793795865.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/lmn807ilas28rs0pkk2qqf412l/73186073555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=respironics+v60+manual+espa%C3%B1olPDF 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_off00012f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14749 17440 bytes
SHA-256: 79071fabbbd9eb9d274692d9d8248d05cf4b2b1cb29d19de176d354c3034e0b2
font_02_sfnt_off000174a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A1 11144 bytes
SHA-256: fbb3a1d4cc525da69d43889d0a0feded278077684e21f219d819dcd35dbcebdd

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