Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32daa1bd413fb9d…

MALICIOUS

PDF

82.4 KB Created: 2021-08-08 10:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 710f40e10c654ad1a16938a9ebac6b9c SHA-1: 56c5ff6fcd9058dc6391c22d73213408cd789057 SHA-256: f32daa1bd413fb9d51cf4d56960265546bc4255623faddab5a22d1e0974fc50b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious content. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an attempt to distribute malware or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://copy2d.com/ftp/image/file/59449703358.pdf
    • https://digireg.sk/upload/91058066811.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/tp3818f23hn527e5d53unsm28s/18820121154.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3918a7e9b4a48ecdc4dbb22878c86889/dejoxuxukederebire.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160763d6687b04---56793948417.pdf
    • http://anbao.vn/uploads/userfiles/file/27048106340.pdf
    • https://progin.swiss/ckfinder/userfiles/files/92423102645.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072866e51935---virisogofuwosemovatuxeb.pdf
    • http://mp-journal.com/media/file/61767344879.pdf
    • http://solarwindependence.com/ckfinder/userfiles/files/zibakuleb.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882e50b9dee---32946429265.pdf
    • http://alnadaoil.com/userfiles/file/50798032215.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33eca36371---lalizabigodujukofajuxavok.pdf
    • https://alnahamgroup.com/userfiles/file/wetafiduvi.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210619_817B9528CC8489EB.pdf
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/wesex.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jepob.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01b7c96c8---40255648354.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a565c1add70f5d5e1b224c801eb270c6/69456468902.pdf
    • https://avigailpekelman.com/sites/default/files/file/nojabogisivakowufijiv.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a030904541bdb62c0c1b30598feb2ea1/42361956783.pdf
    • http://portalkucharski.pl/app/webroot/media/files/nojegofij.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/zuruxetupemijagujaz.pdf
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78707054757.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=una+historia+ilustrada+del+cristianismo+justo+gonzalez+pdf
    • 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_off0000d507.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD507 16792 bytes
font_01_sfnt_off0000ed1e.bin
2599f7d50062203f8e475c7bc74c8c1e24f8146eac6c0b08008ec16ea9350e39
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 11364 bytes
font_02_sfnt_off0001077c.bin
dea3b8041f3f0fc978247f9a0ef4b53e462cd87588b23d2b78e0f72469f7074c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 19592 bytes