Malicious PDF — malware analysis report

Static analysis result for SHA-256 6529a04d6168705a…

MALICIOUS

PDF

86.1 KB Created: 2021-08-12 13:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 769262f679a09871164e22d6dd3ccc36 SHA-1: efdbaefdd6c5fbaa91a97775248066af2b7ec199 SHA-256: 6529a04d6168705a4292281bfdc893e73012d284c585c5683750e2ba58aa71fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=pmp+exam+prep+book+andy+crowe PDF link annotation
    • http://kartinatv.org/uploads/files/sumijiwesetemupepitemoba.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5562a7ff60---lusutizaxazarotepavaga.pdfIn PDF document text
    • https://hssanesteban.cl/files/4823289995.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cafbaa331---dexarelujexulimepabidakev.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210709_1B0322D51181F1CB.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/fededow.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/dakanafopotogijutasej.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a28903b65d8---mobudebafalikoberil.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/68536866409.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/50596800367.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/96786745488.pdfIn PDF document text
    • http://hasyo.net/files/file/59994465612.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0500cf242d---vuxizanogar.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/fakuzewemuwizumaxejire.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609452dd50df0---runapeforikiroj.pdfIn PDF document text
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/82360319618.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16088b348476c7---polewekokutagos.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/rezakapitogubekofopukex.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b235195d7b2---jizibutawu.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/ad36d3ac245a85d33af9499c9fe57cac/363941093.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/jipavufotixawurapovusew.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4e157e586---luledijupute.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/18587933790.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/27719560813.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_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 17608 bytes
SHA-256: 23d24fd90a2ec2dee5f8b7ac873d93914ba78ee5f3d3a9cfe0814da24a294a20
font_02_sfnt_off00013203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13203 10804 bytes
SHA-256: 22cba46959ecac5891a786e4166e6adab987b13f03d586b32036a5dabd94e2f2

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