Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e628fa6e44cb9eb…

MALICIOUS

PDF

89.2 KB Created: 2021-08-14 23:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b7fa26c1441d5baf19635d0c15fceb4 SHA-1: edd1bbc26f6e858c3d36e540969fc660c5b62169 SHA-256: 4e628fa6e44cb9eb79d34e9b6cf6936067c016415a0926ea151416e16506717f
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. ClamAV and ML classifiers confirm its malicious nature, flagging it as a phishing or trojan PDF. The document body is unreadable, but the presence of multiple compromised CMS upload links suggests an attempt to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=pool+vacuum+keeps+losing+suction PDF link annotation
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/fabf500e75559bfb78ba4047251fde44/jositepawa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffbef023c9---40526913598.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/84511901517.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/doxoximoliwukojixop.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb123787e9---rojemuxel.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/70468925327.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/79354841579.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/57b5814d1cf24e9a6f616ff817f35abf/bobidujoridamokaturid.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0ac30a4cc49ab10b9eed6226c334fc16/87050355284.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8ecb76a54---verelojabisujasedi.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/bavugoperoraxazatapeku.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/dc958a69d37ce85f9da77fd4639c55df/kunabudesul.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/pupazawesumukumexisom.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/gedowononomiwibenelotu.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/14689299388.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/tofuxabemozuzafijirod.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5a8ccd7a78242c3679184b8da24e736/boteg.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e59f2273faef96b59c4ebf71bceb91e5/1823764829.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b65a78a7---75323162649.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/9c37669d4b6fa1c0102dbda5015688ba/mesivatorewefilamife.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083fcf55536d---jiruritijib.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/12619308423.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/68578231010.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_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 10876 bytes
SHA-256: 908080fb14b3e64b868ab5281a300dde414df922d1ee66af16316db5c03039db
font_02_sfnt_off00012b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B88 17016 bytes
SHA-256: 295481792a6a20e5cf2cdcf32ad4048a047b892478873c10580bd31c19e4abcd

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