Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39a49bcd1ad8b82…

MALICIOUS

PDF

78.3 KB Created: 2021-07-03 01:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb44af6af960dbeb8ffd3923b4014161 SHA-1: fa2d0be47aeb7cda0f6e537b35c20d59280f6d58 SHA-256: d39a49bcd1ad8b82c8936e6ef0ec92d20ff621640ca6b8f62c45a496f12cd595
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, indicating an attempt to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the primary technique being the use of malicious links to redirect users. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c3dbe4780---32515411833.pdf
    • https://majorsagilekvaros.hu/uploads/file/widusatal.pdf
    • http://ddgasul.com/userfiles/file/2591159253.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/lenigemofojofir.pdf
    • https://premiumtrade.ro/ckfinder/userfiles/files/11243356615.pdf
    • http://reicar.dk/userfiles/file/rudagamijibibozaxolom.pdf
    • https://ddshower.com/ckfinder/userfiles/files/67544564489.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a9610f7ed5b---89467699353.pdf
    • https://palcev.ru/userfiles/file/79514937464.pdf
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/betuzuxep.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a313a504e60---65159534642.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/9739a2982147a5aeada4bc1c0c391132/musoramis.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbd80f3103---43924235046.pdf
    • http://banghaija.com/userfiles/file/wemurazepewofi.pdf
    • https://art-lamps-rali.eu/files/file/42296682278.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a530ff3120c---xutukomuligosaruxe.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/9052723415.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8294c2a8ab---84178186944.pdf
    • http://avs-market.ru/admin/ckfinder/userfiles/files/46126018590.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8d9242d40158d79755eba8056e5e81f5/xusid.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160909af7647a5---kimof.pdf
    • https://t2sc.me/userfiles/94124658855.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b997fbd4bee---dugofivebikez.pdf
    • http://eurekaelearning.com/upload/news/file/1575962085.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=children%27s+stories+in+malayalam+pdf
    • 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_off0000cc74.bin
9ea40ad9d7e32c01327fdcefd3ffb44cf1dbe4498e3b8e8a4bff3d3db55923d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC74 17068 bytes
font_01_sfnt_off0000f8ae.bin
cd01dfba6a5c78b88bf67e1d9f123c1298320939c068408f1a2e83ef045357e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 10940 bytes
font_02_sfnt_off000111eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 16792 bytes