Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ade5ab7ec83dab…

MALICIOUS

PDF

83.3 KB Created: 2021-06-25 15:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bccf03eb3d673b8c3a4aa18cff6729be SHA-1: 8b04678c30817daf5e43c8b022046681f8635195 SHA-256: 58ade5ab7ec83dabfe800e61bd917d0b846cdd8be6b39bb60d9f316ee23e8be5
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://nistd.in/userfiles/file/mifutavimikitavapesa.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbed5d90cb---7386781111.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/46261545ea873fc80811f6741efcafe4/lupujikaligononofikelal.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c286085125---xefipo.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/maminoxamixonodimubizufit.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d462c246f---69949780552.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ff7722095---lepisakotod.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/gji0geolsff1jaabp61mh8l1e7/75211513069.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/723df0149c61f19564de83c0d98cc7b8/28890944082.pdf
    • http://quickvideo.nl/userfiles/file/37951188482.pdf
    • https://hospvetcentral.pt/site/upload/file/gagazutivididagewunod.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/gp622kict3ne2qbilia62q57bv/tugewexigogufamaxipodalub.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/bm7ql1mash15g6bacap3tdpb9a/59622210141.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ce+in+the+periodic+table
    • 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_off0000e41e.bin
a528645ec4452e489c890d7c4e6fba1ee5c1b35613113388bc4ed43bf495e4a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 16632 bytes
font_01_sfnt_off00010f61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 16792 bytes
font_02_sfnt_off00012778.bin
693e4d1a898a41270d91fe78932f299b597c52b7d502289c1c76068f9f1361c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12778 10616 bytes

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