Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3a4018aab284bb…

MALICIOUS

PDF

104.3 KB Created: 2021-06-25 17:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5b1f08fbd62b0d8d0bcd0eefb75f209 SHA-1: 06f8196d61c5177d93a208868c125def2cb2b6b2 SHA-256: 2a3a4018aab284bb22c662b4fd3f54d0066a0b77bfb6234ba0ad12f2322f0fbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these links. No scripts were extracted, but the structure and URL findings point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/71a0843ae5705424aab0d794f563233e/jobez.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607365c1482fe---nililutijamur.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e9c1f9c3bcf8b07f0f7e884e4aaaf74b/tejediveguvakinalip.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/66be08b182cd2c9940317a7a0481c2ba/watisolowitafu.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc8f44b93---lireluvaxadaxavuwalosizid.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/17afea309ae284832187c54c462cda20/zojobisezut.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5d8d49f471fcedcaaeef5b99ae1f148f/nafubavemiliz.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072703a78325---bapujeje.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823de152ff9---14864600450.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/r1q7gtjkb2s208qgeefhhsrnt4/fevomubixa.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/110b729636120cb015f823bd5c6ee25c/lopaburokijojasol.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/940036462b6f785a6abe00020432e330/tedimozifoz.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/bb3253dbedd9e1792503de5c0ef03a12/37999145400.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076084340983---51781128009.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18dd42a624943e83c5c81f8ce4266fda/vebavet.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jmon6fprfh2npe7n5hj2bf9bv2/77314048682.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf950efcc---47385408665.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/49813434712.pdf
    • http://guides2alpes.fr/uploads/file/25145275514.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1906e23620bd06c2ab6651ef80827c7d/vuvolukeref.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/mmhb1n3noo8omdb431dsbb5io2/wibamovajobexuw.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a528fa77afd---71013609512.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dbcd66a97---toluxojager.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e61a4d73fd62a458869e02fdbaa2dd8f/vidanarijubuvoxavozururid.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c384051c769ad96d330eb3e598de78fd/laloludaxonemujulobuma.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=physical+readiness+training+quick+reference+card
    • 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_off000131a6.bin
77f16d6375312e09e6f1be8050cc769e131ba89db15e734698a73f8331ca62ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x131A6 18412 bytes
font_01_sfnt_off00016243.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16243 16792 bytes
font_02_sfnt_off00017a5a.bin
41a91f038db6c22aaf44f04186a9c0fbc671af792a66dc14209c5a67e80b315c
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A5A 11088 bytes