Malicious PDF — malware analysis report

Static analysis result for SHA-256 82722bcd644695ee…

MALICIOUS

PDF

80.9 KB Created: 2021-08-24 14:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8e8ad7d7c55d36fa1c4de39590740b94 SHA-1: a34b25968ace1bdc58c86a145e16c99c00632927 SHA-256: 82722bcd644695ee4a84ba3715d8d327403115dca42b4e0bf2ff41a15b9b9508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=the+monkey%27s+paw+synopsis PDF link annotation
    • https://hirurgija.me//files/52895009559.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/pomoxetegatavavaloj.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/pozazave.pdfIn PDF document text
    • https://cncunse.com/d/files/75383424405.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/55843382795.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/xuwilamejijulew.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/806e5b5182e5d3d29742f90d03e97d53/57879000028.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a644bd808ee---kilenuwu.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/68869672470.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/piputaxepusorerabilafa.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b40c10d2f4c82e65e9b066ed2a05a2bc/wamofaxafaxutulanubezej.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/vebulimuvegepugalosu.pdfIn PDF document text
    • http://llux.vn/uploads/files/45613654923.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8a86a741---90190687933.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b202062d1---keduxopiz.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/28206005813.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/vogonev.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2a117bd6b30a933e368c32f198fb2274/86204128085.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8d6615802f2b061e6656c113032cb77b/37618530816.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/23q2f4mjmoh7f5rbrtp26sutsu/xumufivikojijelajak.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d783aa8122---jegitafevi.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/30402724961.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_off0000dba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 16076 bytes
SHA-256: 06766aa75d315c794b41c840fb8a521b6a8fffdc3d8374ad62d00eacba6b1d4e
font_02_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 10564 bytes
SHA-256: 74a7b884b9ee3d56aedb54fc043c10e5233565c52b2aca1d2c6f627be53b9fc4

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