Malicious PDF — malware analysis report

Static analysis result for SHA-256 d356e65cf8273a39…

MALICIOUS

PDF

84.8 KB Created: 2021-06-28 03:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c32ed5e6b27febb59e4ed60eef49be35 SHA-1: 8bfd1a617bccf5a1ea895f9b1df78badc8ffa5d1 SHA-256: d356e65cf8273a39c7873aa87d7e4a9ecd8da1965c4923e4a91b3c19648a4b45
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve as lures to trick users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://labonguyenhoang.com/img-chamthi/files/pepipize.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/980bf1051c7b3d215730b873af310480/levutujanifukobuvubodoxo.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1371bddcb8---67122920176.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/84478618938.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078f41fa9649---xadugepukapogeripisunafas.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160983cdc0d728---feronibitoxowodepo.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/1a81b8f86ec9d3c291ecfa46c7533f07/4855964643.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/f9ceea736b85198e81bd8a8ec7152e1b/jizajiwomanonevem.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086668c60609---xujokoxiganodaresezor.pdf
    • http://toshiba-center.ru/uploads/files/jabumazafoted.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5f673fdf---rujufezuruvujem.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f98ec63b9---9277572562.pdf
    • https://advance-pack.com/editor_upload/file/fawup.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdeabd97d2---lolowusizojofemuropep.pdf
    • http://artgraf24.pl/userfiles/file/69691855792.pdf
    • http://0965818789.com/CKEdit/upload/files/verabufevep.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/hrnd3hp0a984euuhcpr17fv0i3/55804244658.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/i4ph65pfdcs1tgddd90lh0p5u0/jebivimik.pdf
    • http://fizjoactiv.eu/Upload/file/86390848981.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/a1707ee56987c92c7a9a99ed35a486e1/vaxaganelav.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073c8ae5be79---11465663539.pdf
    • http://evolutionchonburi.com/userfiles/files/10157241234.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701471187d5---julug.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/lizugimi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=being+non+judgmental
    • 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_off0000eb4b.bin
0cea78c79b50cfa8abc3e7572fd2aca3d905680777f959399d25553706a4c216
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 16500 bytes
font_01_sfnt_off00011604.bin
dae70320dfe57ede594ad7d28af1ee836260709aa8f5ca39592187a8844c6ca4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 10604 bytes
font_02_sfnt_off00012dfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFE 16792 bytes