Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ce6c6febe26765…

MALICIOUS

PDF

75.9 KB Created: 2021-09-20 11:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08910daba8c66a94a9d4afc1941be336 SHA-1: 96f1f5412af7ad4ad66f6a0d40d396475098a545 SHA-256: c4ce6c6febe26765cc4cb59ce52b56ef691c637e9f07fd4accbd4875ce6db265
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many external URIs pointing to potentially compromised or disposable hosting. The presence of multiple external links, some with UTM parameters suggesting tracking, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nyett.hk/uploads/news/files/lefowu.pdf
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/80103756200.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/847a9124e7414cea7b69c00e2c05d6be/15341160635.pdf
    • http://federicozucchettiarchitetto.eu/userfiles/files/pulorevijesasalewodokasa.pdf
    • https://www.puskinas.lt/ckfinder/userfiles/files/11076213015.pdf
    • http://tauroconsulting.pl/userfiles/file/53011846427.pdf
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/tinudavemivokikis.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479ae0b4fc7---81850870701.pdf
    • https://ylwlgwadmin.ylwl.cn/upload/files/68948954037.pdf
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/bajerokovevowanol.pdf
    • https://www.gurgy.net/ckfinder/userfiles/files/matemaludosusenu.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431a6b8831b---33270712111.pdf
    • http://zs-oilfieldequip.ru/d/files/magukezewagukaxup.pdf
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/serun.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/olrvnm7hlgcrsik6aon0ubbvn6/jirovopiperudol.pdf
    • http://landroverbh.com/ckfinder/userfiles/files/40127998261.pdf
    • http://chpcentre.com/files/file/valetonixanepo.pdf
    • https://bisnismedsos.com/userfiles/file/luzajuretafakukalasifob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=guitar+chords+and+tabs+pro+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_off0000c202.bin
fb42b067d942d6151306283ed9b87030868515ce8d07e3643982f79071aa8081		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC202 18272 bytes
font_01_sfnt_off0000f1de.bin
31a71dc87ed429544d805864a51b082197ffbea8ab0a4c8f582667463552003d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 10804 bytes
font_02_sfnt_off00010a7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 16792 bytes

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