Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d3c23f06689606…

MALICIOUS

PDF

91.7 KB Created: 2021-06-28 05:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57dfd8eb2808424d5b64b4ae427e49df SHA-1: efe1f101a5942e69edb07cbff3a6893178d5bbd6 SHA-256: 86d3c23f06689606154bbbdd2cdc93766deb76b0e33eb3c4b220d472050bc0db
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. This behavior is consistent with phishing or malware distribution campaigns, where users are lured to malicious sites via seemingly innocuous documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://budoprojekt.eu/obrazy/file/19522795382.pdf
    • http://personnelstrategies.net/userfiles/file/desafesemilur.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/df72835cea82a5a70b28ffa09a039d38/69427603521.pdf
    • http://momsystem.ru/public/file/33341431350.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62d0daba9---53925719706.pdf
    • http://perles-del-beya.com/userfiles/file/66704608565.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/uni8c1nk4bbd8ltctc9saf6a6l/85235974575.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/p723trtdp2up1m3rge5sfiuhqd/burigazolo.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcbe11bf19---gezogom.pdf
    • http://atomleasing.ru/media/File/25234270693.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc5c2d5aa---55445028045.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086be63f4195---samezuzudekoj.pdf
    • http://ei-windykacja.pl/upload/file/94571335740.pdf
    • https://megalightgroup.lv/uploads/files/vivofiditepasopogimaxore.pdf
    • http://globalbando.com/DATA/upload/files/202106181721284168.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429143121385520.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55d96e696e---53682307190.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078de0c86ed4---7670875078.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9fb20c646---72793316122.pdf
    • http://proxima-design.cz/files/file/matefudefasinanoxunolib.pdf
    • http://bbfederico2.net/userfiles/file/temab.pdf
    • http://www.sport-konyv.hu/userfiles/file/zeretodokaleweko.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/261897c7f7b51ce14c4504e5f06286d1/femano.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=anaemia+is+caused+by+deficiency+of+which+vitamin
    • 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_off000103aa.bin
6d4ec2b2f1f2f653c13df9066d52fa95655b5e56784eded948d67a3dc15f9f29
pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 16948 bytes
font_01_sfnt_off00012f44.bin
44c8976205b78f22a5f88268c3c596d7fa8ad1574caac04ce7e35283fb7e30ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F44 11084 bytes
font_02_sfnt_off0001490b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1490B 16792 bytes