Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcf061e4435fd37…

MALICIOUS

PDF

89.4 KB Created: 2021-06-28 10:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a11837bacd38020f64b26bc06ddaf2a2 SHA-1: c4a3557007fec165bd09a5a0fad8709f99548620 SHA-256: bdcf061e4435fd377dbbe718f79291a2b336694329c4cec2820ac420b63bfc3c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://robalton.es/Albums/images/file///terunoxewulodorezidimijaf.pdf
    • https://quaint-house.com/74053910974.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f275ad971cae95bc0703cbebefd68862/wurupatobunolajusobusow.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160afd4eec3d63---43921188353.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f01f034ab---wagobisofobuxof.pdf
    • http://classicalgardenornaments.com/uplds/file/nefafedexufawokig.pdf
    • http://cbgnfinance.com/userfiles/file/15916837059.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/139ac5280f64d0c1e849742006f49ddd/gemizaxuxaponifesoluxarod.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608021326fd82---bowixinuw.pdf
    • http://thepokeluau.com/uploads/files/12576283767.pdf
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/sinite.pdf
    • http://thuocnam.xyz/images/files/56320733374.pdf
    • http://dailitara.lt/bites/uploads/file/teviwetalerawisize.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a445fb359f6---65329522137.pdf
    • http://mpti.ru/userfiles/file/degupuve.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/28f97d3b5269cae83cdca7b321c16a47/gulovapotodefebal.pdf
    • https://beautyreviveshop.com/newerac2c/userfiles/file/98905356914.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b8713034c23a93882147b065e7208cd9/60221801032.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5717e55a2c---83612674082.pdf
    • http://hesexpo.com/img/editor/image/file/mogubeguk.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8754d3c8c2---33324468057.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160836f04d8d1d---demogilipelag.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e36a65be8---zanugufijanomopux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=quiz+sample+questions+and+answers
    • 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_off0000f81a.bin
22a7898cd539538029982043e02db5165ebb793397b480030e31b0ee6847fb96
pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 11004 bytes
font_01_sfnt_off000111a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A0 16792 bytes
font_02_sfnt_off000129b2.bin
46018d147f3b0bf702497fbe812792cce2ea0c6bcf5d9f8e3de30bbc355dd6f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x129B2 18252 bytes