Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8df12bdfbb436b2…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 20:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36b107048d26e013c131a0eef98e4cfb SHA-1: 5934ab90d2a493bc87d54df17458c62da28971cf SHA-256: a8df12bdfbb436b28aae5c61e93db2692074abbd0903624a99286feaa8dac696
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack aimed at phishing or malware delivery.

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 http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864174d4914---13408295441.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096134ad7b1a---56324576434.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e56c4fa823411a3d49125b2d3085b66d/lisex.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0122273f---73532298255.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a7944c3a351---92870461874.pdf
    • http://vamaconsulting.sk/userfiles/file/jajexukisopabazilulonada.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e14db888ce3b7f0ade1f5e51acfd1334/bopulebimoxamisisivil.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/339678611d1643f57ed4642a2b2134f1/26142180845.pdf
    • http://luxcottage.ru/stroykamen/userfiles/file/61381109568.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b22392689c1---mikuwaselopunazajamete.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa401674d1---80826156551.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160943d33c6fbd---62896103829.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5aa7bb896---51569804568.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/745eb757f0c83c592016f3a8cbfd864a/54205031824.pdf
    • http://kantoromega.pl/userfiles/file/kigapar.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8i6kn6m1hfgok4cp0gvtmprf27/witexabazu.pdf
    • http://artecgroupservices.com/imagenes/file/86489820673.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0c2a6f22b1f18468623a8872170d3cff/94065312071.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/uadr8p86j18t1pbsqja73gg4l7/1572648010.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pn8ifce95j4thp23aajse1utj7/fepobagaludar.pdf
    • http://learningkey.org/userfiles/68547518365.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801ada91baa---13336516486.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=french+classical+menu+pdf+download
    • 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_off0000edf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 16792 bytes
font_01_sfnt_off00010609.bin
7f7798b01933227177338948ca4ec81868fabedf722f456e277bd0372a012139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 10948 bytes
font_02_sfnt_off00011f2b.bin
5599b0a1e168303666da3b4c515c1d4fc06d3145e6a6e54ce182ce05de837bda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2B 17684 bytes

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