Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d27bef3b3cf3c1…

MALICIOUS

PDF

103.8 KB Created: 2021-06-28 06:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33a5c8799db60a2a452bb7c7d4770211 SHA-1: 561cad913e6f4fd768c403f3702e083030c9ef26 SHA-256: 93d27bef3b3cf3c1bc957a3bc04ccd67a4ca97b79f9a626bc5cac1b37005fe3c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are on disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=chlorinated+hydrocarbons+examples
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d77ca329adf---zuzitolosetaladitaxot.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0d4b821e3ef73e392876d5b9b8b035ef/19920573855.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c6579a97b016f192f4c2964748482995/70043792849.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/36e1rivo83c4em9201f7lr1cng/tegajowuzefinil.pdf
    • http://wumag.pl/userfiles/file/fumugutajadilesexan.pdf
    • http://maxidmum.com/images/upload/fck/file/89023671050.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/h92mdaf0t2cdsnb04rh713tis4/18539402756.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e197cd3380---dewunumaz.pdf
    • http://phutungtdc.com/upload/files/11226281518.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7432ef1e0c1bb6dd111037b8466c6997/sagusowazogi.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/155140t30s7d0erb6ldvrts9tt/vepanut.pdf
    • https://mokhalasati.com/userfiles/files/zurawajumijen.pdf
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/nerodevumelobuxamoros.pdf
    • https://amitadevnani.com/userfiles/file/43924414328.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba13f2323---3540299264.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/fapo4poq576pncvku2vft4phl1/worub.pdf
    • http://cuatro-pr.org/sites/default/files/file/fasabenesowidomoparujip.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/784b76594918121572afd5025187ae40/xujajaxidifobonaxulinu.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6ec04bc7370d52ddeb53b8fec712389d/nofasizedusev.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/f864fa79388c065483a94c201aa99340/15427712246.pdf
    • https://anakmeong.com/contents//files/78864754159.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_off0001329f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1329F 16792 bytes
font_01_sfnt_off00014ab6.bin
427487772df65865d8b6105c4344083fc0da61a3c7ce2820997e2620ed9293ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB6 11168 bytes
font_02_sfnt_off00016471.bin
bffc314505d427396639c90da2f61767591f2115c3c9de8a5bcd6e6615222066
pdf-font-stream PDF embedded font (sfnt) at offset 0x16471 17928 bytes