Malicious PDF — malware analysis report

Static analysis result for SHA-256 90650948a61189ba…

MALICIOUS

PDF

87.0 KB Created: 2021-07-15 14:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a37f2c072b12d93b7283a304be99946 SHA-1: 56bafc942298109867b54b954edd67f1234ce7d8 SHA-256: 90650948a61189ba6f3665ef1ad283d7198e0241c9c0e25dd215edeb8755ae71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous disposable domains and compromised CMS uploads, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://goodwill.as/userfiles/file/vemupusulaki.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/tidunufepatazijigale.pdf
    • https://medosojewellery.com/userfiles/files/ziwesujavinetil.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/8ca85ac0644d3ae930e6ad9050146ae7/xisokinoveg.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/1oct9jk2694qv6e9esm5bf2amh/73657453049.pdf
    • https://okinawa4d.com/contents//files/47380015750.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/116c2e070352cc6c9f58b6ed969c3463/supeforer.pdf
    • http://linkipt.com/_UploadEditor/files/23917584094.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce51b0ed45---54454431370.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b8424f911dc---36926054391.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0810d11bd---77616559181.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b4405e4b---nasekikav.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/67f1b8ec21b38c287a18124dc2bd0c8e/60205175895.pdf
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/61489880196.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bedf65bedc---janoxilevifa.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607823993c266---sinojodepirujod.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/108db546c4668e54ef09256077a55a5b/20438761573.pdf
    • http://berbun.com/user_img/file/87538187867.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/afeic7m2a04j1p6c8m5cbci674/lufamufavof.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qen5lvsund3qnjs71ufagt4g9e/32633941679.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cb6fdc78a---29150476944.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758443dcd18---dokobab.pdf
    • http://dnepropress.net/files/file/32198455662.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051711848_243374622.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jtknscjabhb707ou2bhhuss2mk/pudimesaferegumakevos.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7b676c52---86633464082.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a76366bfa---lisuwejomedefogoxizisu.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c096105fef---23608087956.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=average+speed+a+human+can+run
    • 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_off0000f202.bin
56974d655e7b3554a8cb0559b6c382c21995e16b411f0f63ef784209e61f4c3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 16796 bytes
font_01_sfnt_off00011df2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 16792 bytes
font_02_sfnt_off00013609.bin
c0ac136d40076d5345c8acbe924d6953e99d3afeebeb4c34d45a43afa7f7d07d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13609 10752 bytes

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