Malicious PDF — malware analysis report

Static analysis result for SHA-256 73125dd7ca7d8591…

MALICIOUS

PDF

115.9 KB Created: 2021-06-28 02:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 0f74b406178a413cb4c8c6c0d2667c14 SHA-1: d440c6ffa4a91746b51c2d4c3571ee4f1f591894 SHA-256: 73125dd7ca7d8591ff9d313aea82c5169a0f73779b9d11d1111c1991a91cf4b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the link farm and the detection suggest an attempt to redirect users to malicious content, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pbchistoryonline.org/uploads/file/latilagosizapeg.pdf In PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee2eb0fea6---87179782051.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/37pbh7l7kqkl1r0uan39n70m0k/likatefefo.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/juxokidozekiforevudod.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f97f4cfafdfccc3c33e75e952d44b300/tezunaguwu.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/d228b8b915d53811984df882b7f4d5da/73765277502.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607592ba1c9f1---lanawirapakoxajewexexal.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e38509c7f7---gebajapawezaf.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/93182635420.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/fukowef.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/51516103784.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ba7e0d940---mowotazukabowugudiwox.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/mexuxinuvofod.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608517d1f229e---19451820662.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607581cf9255d---vovewi.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b008e87becbe29be5c21dcfbc36f70ad/fitomenivozevu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e99e545403776ba61a5ae3989c6ffc6e/nivoxovegimegujefuzena.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/4jg05a2vs70en24iu27qtpdckv/62316611642.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/b1140acbf5f13777884ee50edf95715b/45031135811.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/riekcp5t4is0908k5fsrsu65cb/98282041794.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/18358187593.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/nutinogivojizazirajari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+kill+zombies+in+lego+worldsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000160a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000178b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178B3 18840 bytes
SHA-256: de78bac476e25df7f38fe3d3397c6d58e20494ce80b971c2ecdbc4bff1219e84
font_02_sfnt_off0001aa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA05 10800 bytes
SHA-256: c63665f942fc02b640843ad5e7e3bf204cdede0f76021d30f75e935b5006ef72

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