Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfa29e34dbe567c…

MALICIOUS

PDF

85.0 KB Created: 2021-07-02 05:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16605c71f98cb5fb2fb7dd5022d4b188 SHA-1: c0657ee3c76ed64f9218d55b51ccb3daf3ad9a30 SHA-256: 8dfa29e34dbe567c7e30c15b6d399e8dc4578380d342fae0bbc1a53fee97d340
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised websites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an effort to obscure the final destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://phuocthuan.vn/images/pic/file/zovifiluluworoxe.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/vres6mkeckd3sf9ha5pee40gsv/zinukatalojinuvemomon.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f95a0512351ba2ce8506a14e4f909e5d/vudixelepewovulosevebuxow.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eed462d147---puset.pdf
    • http://megalaserasia.com/upload///30448104362.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ahnlkhqj1cus2d8qtmuln3ubq5/69944922833.pdf
    • http://pcserviszlin.cz/ckfinder/userfiles/files/89271312523.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/wugirugefijegeduten.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607404ae64e4f---luzufogogozojeb.pdf
    • http://hanhthien.net/uploads/file/wokadita.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607faec71543d---dogumemakelupulatu.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1ae3679a414a509e89005479f74c970b/rubevalewokuvazo.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e338d4cc2d---67736541740.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad82c2571f---gururirutigakeliluxu.pdf
    • http://hopkinshigh1988.com/clients/75739/File/sekawubutabetipugosarim.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eedc84b644---gatigakovip.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/02799c9a17dd98341df1d64663e33d9b/12427427106.pdf
    • http://www.look4job.gr/images/_user_na/file/63385209292.pdf
    • https://inncredel.com/uploads/dojaguleximo.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/28a8334c4cad27a974ed0cd1922718fb/nigizozokimexokaguzun.pdf
    • http://geologocarmignani.com/userfiles/files/tokuboserit.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98f333c07d---kedamaxudibafumufuwenila.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lion+king+movie+download+in+moviesda
    • 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_off0000e5fe.bin
2c81e65eebaffd5d927f630bc534a54a73e76ba62013017a5384aa52db75fa15
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 17936 bytes
font_01_sfnt_off0001150e.bin
045eaa4ab37b7945b310b4369303b1931a7de66b4517af5b70047a393b449376
pdf-font-stream PDF embedded font (sfnt) at offset 0x1150E 10596 bytes
font_02_sfnt_off00012d11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D11 16792 bytes