Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7acc43dcf48ae95…

MALICIOUS

PDF

76.0 KB Created: 2021-09-22 22:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bbc1b79c5ea84eec33db819cce04aa34 SHA-1: 6fb037b5f4a87a439a3749f875aeced3e757e31c SHA-256: c7acc43dcf48ae95af5ab80d1aea95634988b4b37f6f8fecc539916f65140b98
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and link farms pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent. The document's structure and URL patterns are consistent with phishing or malware distribution campaigns, aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://infrive.ru/uplcv?utm_term=facebook+chat+apk PDF link annotation
    • https://bednidhitraders.com/userfiles/file/zidapegavowubesu.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/47444740463.pdfIn PDF document text
    • https://pepsima.biz/files/file/14183974544.pdfIn PDF document text
    • http://cke.hk/userfiles/41625356645.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614186e633281---23917085782.pdfIn PDF document text
    • http://engelholm.boj.se/uploads/userfiles/files/zijikokunarizidifo.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/tilunalevogimosikejirovi.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/kekamede.pdfIn PDF document text
    • http://bushurov.ru/images/files/94344333051.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/88934923528.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/dhbcbnm88q8g5ate8blcb7h4gg/27615328398.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/kewafaxakok.pdfIn PDF document text
    • http://normel.org/files/upload/file/29607215814.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/82216102522.pdfIn PDF document text
    • https://landi-bg.com/images/file/86033625849.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/98133818727.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b488431130---baritoxabunib.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/70751763634.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/lisuko.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/30666182632.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_off0000c3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B6 10172 bytes
SHA-256: 8f869f7f5b1de3340880317832ffa140cac0310c2c3c6002cb83a726908a248c
font_01_sfnt_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 18652 bytes
SHA-256: 074182d8689d9cf3d54220bfc58b9942345f48818b0286228e7bd0c693bbb505
font_02_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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