Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b92c0f14138594…

MALICIOUS

PDF

82.1 KB Created: 2021-08-17 17:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 77522e3d2f0f8a5b48798a1be4c84df3 SHA-1: d35d4af1a8259a19e41716847cf1241ba10667f8 SHA-256: d8b92c0f14138594a31577de278af25d6159f8d3103e10643eebc786b6d5a4bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links to external websites, some hosted on compromised CMS platforms, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=sample+cover+letter+for+teaching+assistant+job+uk PDF link annotation
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8710b7b62a---vaputagunokurejumorolof.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/vamesazuwifopuremabari.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/zusorekaxolip.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/78619254756.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7627723b---sawexekidedujotavijudum.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/sirunodasixevaruxodexuse.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/legoxasuwatajapiger.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/nusomanitamozusovemir.pdfIn PDF document text
    • https://schmitz.cz/res/file/sifixexubebujinalopugo.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a310056231d---rifigigowo.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/duzabizesuz.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/17628978416.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/84518162296.pdfIn PDF document text
    • http://clingac.com/d/files/94097827150.pdfIn PDF document text
    • http://quinta.cl/upload/files/wejokesebazebo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b891cc766843c1070aaee9cac8fecca1/74300433214.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/gukosenedonizetapituduni.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/31622780103.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/98431387335.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/0fd95daad1f99a5f47f6e167d797c691/87656944539.pdfIn PDF document text
    • http://614move.com/clients/4890/File/39593965287.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/aa057a1e9f3fcb06d081dfcbad6836d7/13657361186.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748ce143edb---tixeratimu.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/raworureviwisoxutox.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16097480a5ee6d---nakadufobivebagevido.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_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 11528 bytes
SHA-256: b320b6794168e6fd415bfafd7614f33f5f9ed470e5ccfb85a43eaf3275598ab3
font_02_sfnt_off0001115e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115E 15748 bytes
SHA-256: 7e0bf9cfc0f13ef12869dcd675e2763553d5c2f6b57fa7316d1e63f62e153627

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