Malicious PDF — malware analysis report

Static analysis result for SHA-256 95dd517ba17b6168…

MALICIOUS

PDF

79.1 KB Created: 2021-07-08 01:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: daa2d8cf8a50c6a63d5b1bc8b0f5e9c0 SHA-1: 8fde52c2b3dc10970761739f363bbd872e0582b7 SHA-256: 95dd517ba17b6168f7b8ca3c0863c836632f0f590442a5c3cbc74082606e665f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious or phishing content. The document body is heavily obfuscated and unreadable, providing no further context on its specific intent beyond the detected malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/b24aec2ad2f523fbcfa4d0bc058ce264/rijekavobib.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b1bdbcf0bcdee6c44fe52070eebb531a/28583787404.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0405ab5b---82183505505.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160725a7944c9a---73231250011.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ufg5cj2qlbo5v7d94aj5cf6fl7/26492323495.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/mji1ciofeuhmp23q724luggfdn/7770561912.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da047454794---30040782192.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/9c1982ffa9c17c68009cfef815a407da/69884342328.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafe7947e4---takufusigejazakulakiko.pdf
    • https://giustofiori.it/file/22091161984.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a73766c6620---48355162021.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/63p5v2uifuk48mnq6r46f4nvi5/78887483991.pdf
    • https://egca.fr/userfiles/file/41015645460.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba6cf722ff---xoxiguvutikilezopi.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160792d7f9a8d2---veradetaruver.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2697abc54cdf8b1127cd9e31ede1706a/sasexigezebano.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c71e84aaad6---39336054077.pdf
    • http://mistral-paints.cz/userfiles/files/turapudaxidemejov.pdf
    • https://pbchistoryonline.org/uploads/file/75058674149.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/52106056551.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52501cc85---75000940459.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0400f56ec0---38440488481.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=rooftop+exchange+place
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d135.bin
39d5d2428cb40dd0558458dc1fe0b7fcbe568284377d1e998fc72a40e3ac1fd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD135 10544 bytes
font_01_sfnt_off0000e945.bin
fc9d1846cd92d9a67af841b61282f8351a88e37fe4101092bfd9d8ae8f182a56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 17132 bytes
font_02_sfnt_off000115e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 16792 bytes

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