Malicious PDF — malware analysis report

Static analysis result for SHA-256 401e304ce1156354…

MALICIOUS

PDF

88.7 KB Created: 2021-08-25 14:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 155751162252048f5ca44dadb7eac222 SHA-1: 8df609f5608518441ab2c8f6a19b8b263e3d7e22 SHA-256: 401e304ce11563545bd8bf6eede2516fb148fa152b66f351d25886c404706bd6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting suggests an attempt to obscure the true destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=asians+with+blonde+hair PDF link annotation
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/kawuzus.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c971e68be47---pokevekeso.pdfIn PDF document text
    • http://abnicum.com/files/file/79638123540.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/38820166006.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/15695909494.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff3a642746---gezunufelukazi.pdfIn PDF document text
    • http://goldmustang.com/files/files/19583668572.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9ff39cbb0e941481f41d86c27aef392c/mepiledenisenowi.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca419c567---suxenigiv.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zevuvisegadujegukesit.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075abca2f173---vifagakoburuwonuwi.pdfIn PDF document text
    • http://fabtur.ru/upload/files/8310061059.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/tipewuxofunipovap.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kebebuwulufusa.pdfIn PDF document text
    • http://airsoft1.ro/files/file/62066711526.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/92773672079.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160da712d6d9c8---90618740541.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ede622a19---97999900916.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd58581922---bojijudefiwuk.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/bafesat.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/83976831283.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a7e479f9---10201504802.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8260e18ccc---37474691684.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/bdd5dc1f2e1ee5633f2609556a5b54af/85311885940.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_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 10552 bytes
SHA-256: 536012f4e03f00660c320c6fff526cc13007b5c152c73b4c440587f8ecd99642
font_01_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 16376 bytes
SHA-256: 619b6ec8b04d11cfd7beec93050a64014965c564f6a90f3cc250aec93b7c9447
font_02_sfnt_off00013c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1