Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e3ec9c69444cf0…

MALICIOUS

PDF

90.5 KB Created: 2021-06-29 13:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0c92b12b46b8a6849b34edd8db55ec3 SHA-1: 2ebee8e28ab69b442ead8649cb3dba8f2347d7bb SHA-256: 85e3ec9c69444cf0a0a661a9328f6259946e627f5e6e32c6403ef3693959164a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to lure users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://dishandspoonproductions.com/ckfinder/userfiles/files/38666404737.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/16544237320.pdf
    • http://mini-garden.ru/userfiles/file/68743575521.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a139e7d546b---gekewenegixuna.pdf
    • http://amandamaitland.com/images/file/dimonowida.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2979068922---91682155009.pdf
    • http://andlupa.com/userfiles/file/41594291003.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/211166387.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df36735bd7---kirewof.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ddeb54cceb99c4856ba60ea5a511606/67680076325.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/tpndinoc52knna9gvid3kpdq20/fesebusufatebagoseburiwod.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092e52ab6c59---48812109818.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/52fb5591f858f5fd8c6e00441e0398b7/bunobapaluteruziwu.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fd3452c669554860670fcf77daadba37/45039695248.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/30ecda49p0211fhbt7vmdh0llk/10477949623.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607994fe1d579---sukovaxaxulelafutarum.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/fa8d1723b54cdbf586adb985074b2d87/fugerejifisaxutuxa.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/358bfb61a074914c96f12a0000b46301/23006182078.pdf
    • https://angkoronetour.com/userfiles/file/21168498165.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/fc8d4fc54f9548e2dc5dac49437a6f07/35741688922.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/bc8dbc5a1c3a48397cccf506d1c6ccdf/58373842815.pdf
    • http://luberoff.com/userfiles/file/momizogoxuk.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d000f694a3---43480562833.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=designing+and+conducting+mixed+methods+research+pdf+download
    • 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_off0000fbba.bin
58452fac99a2629c8444aea8456889c33c36189a4e42c452e433f4774497c9e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 17964 bytes
font_01_sfnt_off0001298c.bin
6bb7bbe431205d63b9acedf906ed053c369343b27f2dd9ccb00b6b14c8658a8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1298C 11356 bytes
font_02_sfnt_off000143fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143FA 16792 bytes