Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b749cd92671e064…

MALICIOUS

PDF

69.8 KB Created: 2021-09-16 14:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21af40e71a7a4c80c030f7df963ae66f SHA-1: fb241213c1ddf7e81a782bb07ccb256949492eb8 SHA-256: 9b749cd92671e064fae4c656f6e152f0abf88a703d6c8f917944d8830b4acecc
176 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 contains numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'private viewer for Instagram' lure in one of the URLs points towards a phishing or social engineering attack. No scripts were extracted, but the overall structure and URL distribution are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=private+viewer+for+instagram PDF link annotation
    • http://yonezawanet.jp/units/24250/zcycom/files/43601060776.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/zetivanosezaduvodogumuz.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b1f38c59e735342cd9e5252d875b5c1d/33727759258.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/gisitoj.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/vojovej.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109161916525571.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/pokijozaxomuxevasej.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ce2e87a46d866fc07c9bba7c3cc506b7/33777383884.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/rejexibezeromuronedon.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/72379754656.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/14018375563.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/juxelelosafumobuzotas.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/gugakafikeligilivelu.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/87979325710.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/48368217458.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/tikakaliluxup.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/41318146333.pdfIn PDF document text
    • http://didula.com/img/file/rowenawigeno.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/56080000134.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/10776540086.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/jasowuzifujeletar.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcbaf1cc1a---59198953282.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/2761048943.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_off0000b3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C6 14764 bytes
SHA-256: d0587ffdbed942818328d65de76682c2c575dad8182072e79874242f26985700
font_01_sfnt_off0000d8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B9 10664 bytes
SHA-256: 19cffa8546f8e7cb8c8595c151f1a500b42e26f973b9e785b50e65863a9514bd
font_02_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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