Malicious PDF — malware analysis report

Static analysis result for SHA-256 f437a37a2f43fda7…

MALICIOUS

PDF

87.3 KB Created: 2021-07-18 00:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b6c444000e3d517817682af8692594d8 SHA-1: 78b47142b668deabeee3b2e36857a0afc9067f6f SHA-256: f437a37a2f43fda7931375c6a8944ec71253d6f018a8a8f4e3c835f259d25326
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farms indicates an attempt to leverage external resources for malicious purposes, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ajivikafinance.com/userfiles/file/40859747240.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d4be95db6dd784369d567a621b2eb3ac/54867560993.pdfIn PDF document text
    • http://parilka.by/var/upload/file/komulu.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/53162933545.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ac185318b4ae0dc1f15405d4b150d214/80317049716.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b0839765de5---46521826971.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/39555631081.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/dugonopinune.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a98201e2d2f---20576779312.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/856d7697b98af06e737f15d59c437996/36086352486.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e121ce4d---sizazelatageboburesa.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abfab67cf20---boxumokega.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/20003921351.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac721cae35b---17996917367.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3c59d582ffa985afbc50443babe0b1fc/porelal.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/domakogeraditojik.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa71106a68---64668820640.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/09cea9d83562b9ea9757abd0a48b727d/vegazas.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/26023460907.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/ddb627ffaa404c8c4cadf2c8b572335e/66882709050.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb27dbb17---vagadutiredefokidixofija.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b8e35aa5b---37552301926.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/91086083795.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/02a40ae23e29a028fbd52a4b8c9d3afe/waxabigegebowoxan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=nms+coordinate+exchange+multi+toolPDF 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_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 18152 bytes
SHA-256: e5b5208ed754cfb8f39ed27e018905120c0d680d72b543316fb7a549191099b2
font_01_sfnt_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A5 10996 bytes
SHA-256: 6f0c0d2313cb0db73292b466a85c11fd512f39b87650bb4377e237ad07cb79d4

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