Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40b624c05946316…

MALICIOUS

PDF

90.8 KB Created: 2021-06-27 00:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40c88b13af291e536e61d9637f1358ec SHA-1: 271fd0372680ba7d0d60436706ad9b52fca9ebf9 SHA-256: c40b624c0594631676c64b267108372ad40d692e8b0d09c3813cbc18bdf7dc0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as lures to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc26e62c6---batarad.pdf
    • http://alituncer.com/userfiles/file/bedojuzisib.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/sktdgr1jbp8gehcftv8hgt7ifl/zotas.pdf
    • https://contabil-fiscal.ro/mm/file/kitexodasulozeterela.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ko8v60fasmpie85s1cmguc3vtb/5211972588.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/84qcntfbugcpnhs5dpmvl3itgl/jonomuredawufudixonoderi.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/g4n4g92nq6hd0edc91qhn9qih5/vofevozerijef.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609db5395b577---sugegizifitenim.pdf
    • http://leguido.net/files/99423668785.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56e83cc05---86962190001.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcda95459---93679668154.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16094b51b43f6a---51064276127.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/m030ftgc69o3l1cub3rjdvfb1c/peviroduzadenojogetivu.pdf
    • http://gtlmarinefuel.com/userfiles/file/gaponibosozujofugi.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16207494677987.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae4e9bf8d8---68980116167.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8qcootvkpeb3vh32rrbjc8049a/66368277455.pdf
    • https://samowar.ch/upload/file/kenazabejenokivazamu.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/semanojosibunizu.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eec57ed01b---lerexuluvoje.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3babb1aa255a9ab16baa29bf8fca2a08/68074492628.pdf
    • https://alutat.com/data/file/pogoxobiziwarop.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/588cd5111da487c181ece8739c1767cf/kakorivopirubinogova.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/46d73bf9f1ebc7411bec263201d26d59/16223869538.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5dfa3a1bf---ludelidigawelazi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=shaded+area+of+a+circle+calculator
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e855.bin
622fc99d12947b7745175fb1f53294e4014f63a310d979220e2fa95b267b56df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 10476 bytes
font_01_sfnt_off0001003d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 16792 bytes
font_02_sfnt_off0001184e.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1184E 16312 bytes
font_03_sfnt_off00012e55.bin
5cabc91fa0285b14bbac3f1bb07ed33dd86123ab9fe952e73b66d1811e004484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E55 17728 bytes

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