Malicious PDF — malware analysis report

Static analysis result for SHA-256 685768d89ca3c38a…

MALICIOUS

PDF

84.1 KB Created: 2021-06-10 15:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 70e152756d61aee16ab828c8dbad945e SHA-1: b097259552831a666782b54b715a39685df47fe6 SHA-256: 685768d89ca3c38a4156edf57a5719fed4357130559984218b6ec1c47bfdb051
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body and extracted URLs suggest a phishing or content-luring scheme, masquerading as a search result for MP3 downloads. The presence of numerous links to potentially compromised WordPress sites further supports this, as these are likely used to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://queure.ru/uplcv?utm_term=chogada+slow+version+mp3+download PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d05c42f821---34866811235.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2871622bbb82b3fc6ff3e9ed6817d840/17993428624.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/texawubumoj.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/81026212895.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/98851945078.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/3cd1e424c0ef389cc039e5851f4fdcc1/58680237364.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d1822b3c4---zilofaxofofaxesutaxetevu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160861c4ba7883---lijepukadekadi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60dcad8d05---37119290341.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/97942900497.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/gemada.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/91b83f119e5766bbae63e272e7ed7dcc/bugumogeruxavugibu.pdfIn PDF document text
    • https://areicon.com/images/file/kiwegidutatobota.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/59460025532.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 5592 bytes
SHA-256: fbc6beec381ec9ad4a6c52d9bdc97589c7fd4896c6909f5ed9a2157c7b4675ac
font_01_sfnt_off0000f1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 12348 bytes
SHA-256: f59f3411ffdbd58ebc77d2145ab561a01a97c6d8e1499157c51053f596bf1443
font_02_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 16248 bytes
SHA-256: 4f804c299e8f8b6474d1f0ecd9b6bca4852d8569fd41039b9a1fce38313b900a
font_03_sfnt_off000131cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CC 4432 bytes
SHA-256: 22085546f66489f7a40686a6c022d3923d267743445037c24c23e3842c4ced5d