Malicious PDF — malware analysis report

Static analysis result for SHA-256 2174f1cb40d500f1…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 04:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6bab43bbf612251568835b04514722f SHA-1: bff568cfe064316ad82bd5705cf3821ae9f72790 SHA-256: 2174f1cb40d500f15ef1bd63537140a9f2719767973a00eb4b6f4f9fded978bf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external links and the nature of the hosting suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://geyuping.com/geyuping/uploadfile/file/2021091613454473499.pdf
    • http://studio5r.com/userfiles/files/29039693685.pdf
    • https://thebillionbottom.com/business_school/uploads/file/68787145754.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ighkfp7f2pjr9p0odp65dkt110/53987566363.pdf
    • http://speckrepeg.by/UserFiles/files/vevutalemadim.pdf
    • http://liavanhaeringen.nl/userfiles/files/likulisuwexawegeraduzoxi.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/54493663008.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d809c698---85633781422.pdf
    • http://ducthoaudio.com/upload/files/belamanunekomopifagab.pdf
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/90201079988.pdf
    • http://style4.allwebeasy.com/userfiles/files/viduxaxaxi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161466e1f8deca---7259248342.pdf
    • https://tele-video.ru/upload/files/31876784548.pdf
    • http://www.americaninvest.net/upls/files/28239087972.pdf
    • http://lightofislamonair.org/uploads/files/34033738286.pdf
    • http://badgerhillfarm.uk/genexoke.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/85875574477.pdf
    • http://dmhu.eu/uploads/uplib/file/molomeni.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161360eedb8c04---79927522400.pdf
    • https://giga-tronics.com/userfiles/files/gekagimepuritir.pdf
    • http://pomocnaukowa.net/Upload/file/xamadipagorogukipedis.pdf
    • http://www.petersonassoc.com/emailimages/file/wujiretoledenop.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ultra+psp+apk
    • 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_off0000b8cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CC 16792 bytes
font_01_sfnt_off0000d0e2.bin
ac6e3988fdb854b5cd449833d628e60f68559e97051bb99d9625f9f51825ed89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E2 9896 bytes
font_02_sfnt_off0000e6db.bin
c796cd552256f320fcbd6f0e0b96db1c67af8684830dcd72203d0c4602a0ee99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 19328 bytes

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