Malicious PDF — malware analysis report

Static analysis result for SHA-256 026273ff38f7f5b6…

MALICIOUS

PDF

102.1 KB Created: 2021-06-29 12:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa9bc8f179531e99f694ec5c1e7f496d SHA-1: 235a49928657a94175c5356476ce37ea000cda93 SHA-256: 026273ff38f7f5b6bd119802500b3189168f11d2118b6ebab84a952b411e59ba
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. These URLs are indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160749ea628df6---dajenufukalosite.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea3dcbfdee---90745767109.pdf
    • http://hum-lucknow.org/test/fckeditor/file/vozevenodewiz.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/ee70169e1c9d19ad9c7c1f3016e50abb/metiguzifozu.pdf
    • https://mk-sito.it/uploads/file/16568138058.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160778992e2d03---jesidiwifo.pdf
    • https://wita.lt/images/files/bivuke.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4fc5104d---geribujiwob.pdf
    • http://1utilaje.ro/mm/file/28335069921.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16072f32761f90---14276579011.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/273bd8552ecaca0e2bb2ee8f6a9748b9/muras.pdf
    • https://pellevah.com/upload/files/mivamesibosav.pdf
    • http://patriabrno.cz/userfiles/files/657035268.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/27df2246e5b83ece5ad6d4ec0ffecf82/fopudi.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7d8ceda89a3aaae8fe159799e7a62bfd/65380010696.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4f14976fd9e333e148da56330329cc12/goran.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082ad434a25c---81798617494.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/b928456da7d9340ef27fe9f2e40993b2/46950682676.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832acddb63a---4128956300.pdf
    • https://travelworld.ro/userfiles/file/wukakelalifirurikured.pdf
    • http://myphamlulanjina.com/upload/files/kokigatokap.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc54299bdb---90944362460.pdf
    • http://imailbox.nl/images/uploadedimages/file/jobowazijelig.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6dc65b221---88851500437.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=questions+about+the+sun+and+answers
    • 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_off00012559.bin
b124f3005802a749fb297741689f8c781c2ecd9ad5b6f7a3ccb47dec9dcd7fcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12559 10684 bytes
font_01_sfnt_off00013dfa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFA 16792 bytes
font_02_sfnt_off0001560c.bin
e9bbd4fc0604ec522430ebbb48c121eba5c0a0a57573c268e32a6f671f71f816
pdf-font-stream PDF embedded font (sfnt) at offset 0x1560C 19432 bytes