Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa78249d3a6dc99e…

MALICIOUS

PDF

94.8 KB Created: 2021-06-29 11:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 005bce4e1bd30153a14c1bcaaf678f3f SHA-1: fa6972dee25f131d2f1e6851e4974ebff692cd8c SHA-256: fa78249d3a6dc99e0ea0b537392127469c18f9ddcf9b554933fcf9337a1b95d8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide clear instructions, but the presence of a link farm on potentially compromised sites is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4fffbcf02---67869406663.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c767c504a---gofebogo.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb05a4c231---21820481381.pdf
    • https://jotekonybakterium.hu/userfiles/files/74265084.pdf
    • http://tribo.kz/userfiles/File/sanewujalevarosemosed.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/791944bc7c8fd1fe90398389339ec769/30876277112.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/942e18d33f8ffa58564ca723b252d238/tomidufezumaz.pdf
    • https://pet-fashion.ro/mm/file/ropekofafuboguxosib.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mn89pj61qtdgkk1peaibfvkp73/97528191459.pdf
    • https://local-atlas.ru/userfiles/files/pujure.pdf
    • https://szabobuszrendeles.hu/files/files/24483700751.pdf
    • https://senhewood.com/d/files/69904988553.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cee71d65a32---50142164024.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/rbj3aogj06q4ea6dclgirpdel7/bavariwekapi.pdf
    • http://21cedu.com/pds/userfiles/files/dewadabikolutub.pdf
    • http://peneleos.pl/userfiles/file/20268656759.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/35v0un5vejne59ss53u2rdpef3/26406569782.pdf
    • https://giovannicaputoboutique.com/file/70653875823.pdf
    • http://x-site.by/upload/editor/files/22696735705.pdf
    • https://ckmandarin.com/uploads/66019441959.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/o5udv9089i3592dj89mrstlu16/vafazafatupan.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/e798b76fe3fc20299e793210dec982a5/28489490902.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1vepltd9h3u7mtnnc88oe2lca5/2015014641.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/4769cc91dd2795ebf03bfcae3ef62b4e/vakukoranu.pdf
    • http://xn--80aikni6a0b.xn--p1ai/images/file/61988034871.pdf
    • http://dorp.pl/userfiles/files/97931257386.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/fud0v76j9jsra8fbcloge54d62/paninuvudolefof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hvac+technician+interview+questions+and+answers+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_off00010cbb.bin
16dcb12dfa61457bdaae5560c6432b5144465d100bfb722dafee864fea291527
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 11060 bytes
font_01_sfnt_off00012644.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 16792 bytes
font_02_sfnt_off00013e56.bin
cca4741eea740af11da82e56c01c72e5dae161e74454d97e20ae2dee91740e37
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E56 18008 bytes