Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee856b124bef6c22…

MALICIOUS

PDF

127.7 KB Created: 2021-07-21 07:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db595af7a4283bbc66473c125f5e2c56 SHA-1: 591c71c3a448e42a112455de756c998fe3faa84a SHA-256: ee856b124bef6c22e142672b9c818f34a223fdac4d738f0825907588d6eda734
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to malicious or phishing websites. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9609

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://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/l5udrbovs1n3p6hdtlnuu4nqr6/48823303983.pdf
    • https://batdongsandothanh.vn/luutru/files/13070803859.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/7otmre65fnji5tqu6pfv73fvb4/40869404734.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/4p58i76ch2t9utbdlor9r4a9cn/tapipizesovida.pdf
    • http://ldbell1965.net/clients/85689/File/raxokomeda.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a6b29fda00db99a01096a40b53545861/14832562044.pdf
    • https://bustotoronto.com/userfiles/file/68251567508.pdf
    • http://kameleonhastanc.hu/files/file/juzudewaperaboped.pdf
    • http://aitrans.cn/UploadFile/file/F1202106171152278653.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/6f5c110f59e961774db0224c731ddcfc/vuxewodosalavinarowa.pdf
    • https://hondaotohaiphong.vn/upload/files/pamutawidovu.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/906e16a61633566ba327422677e745f8/wisojisividifugibof.pdf
    • https://paidionresearch.com/userfiles/files/81603178829.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d42230b19f---nudiwavi.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704579b9464---foritasawudimubaxawij.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/h6rssd5tebrikr49852cfth16f/lidibenagaverezevevanonuj.pdf
    • https://fablab808.com/nbloom/fckuploads/file/4255069456.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/480b512957d6da24ef460999fb4f74dc/nonasewidilewemebopijuj.pdf
    • https://art-lamps-rali.eu/files/file/geluxudifapev.pdf
    • https://lederstuhlshop.de/ckfinder/userfiles/files/33898141166.pdf
    • https://ruxthai.com/ckfinder/userfiles/files/17957196025.pdf
    • https://bititechnika.com/uploads/file/wesupef.pdf
    • https://chaplains-camps.org/upload_picture/file/potig.pdf
    • http://dermalab.pl/userfiles/file/bokixajalones.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=upside+down+triangle+text
    • 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133dc.bin
2a5ac42e58335399ccb9c02945f6d08306f8a79fd49883b6d8d3db3bf547c3be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 26304 bytes
font_01_sfnt_off00017bab.bin
d8e4418079f8e306c3f8c7b3ed164122d48a0884ae2a50b2f8d162d54619be5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17BAB 10760 bytes
font_02_sfnt_off0001945d.bin
98ff1da902581e9f22e6a8998885a328858fc6c69540d1f60ca79073954dab71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1945D 2492 bytes
font_03_sfnt_off00019f42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F42 16792 bytes
font_04_sfnt_off0001b753.bin
07fc202f2167e87d664c01b4a618b6579ea77b9fd8caab7a538f0f777330b138		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B753 20768 bytes
font_05_sfnt_off0001dd58.bin
3f30313d6b69c6009a59ac801e528448c3117aafc13732dd0118d77f50969ae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD58 9036 bytes

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