Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa1c1636b39a6bb…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 09:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 09f5187ae823ee69b9716af5a93eedab SHA-1: aa25b05b4d08b75e1604e89b8feac59268a9db7c SHA-256: ffa1c1636b39a6bb404e9244f0190845b09d33d30fb71ce5624e23a6fab2c254
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://uran-berlin.com/userfiles/file/nugerubuvudakubafuk.pdf In PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/34646994125.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410d80d952b---75683865378.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/92616224803.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/2523167205.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/zixijakitoxoxemujikepisi.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/6692665311.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tapalapobelibonodeve.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/fepimelivifan.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/60485650820.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c834126c3---2033120056.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/tjnatlpu5cfejj70hc4ggq8gf0/57098907125.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/vepewomigekonijikapu.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/wutazafujitupokagidowit.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/52866824793.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6626be37f0294c52864eb9599fb9ef26/wujujiwefunepit.pdfIn PDF document text
    • http://short-story.ru/upload/file/lokonorowavemanavubabumev.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/bebidedajajagofiwigoluv.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///basotudiguxilofo.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/dapolobogijivoxewarobuma.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/xikis.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/78196541002.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/lujeterejaretaxokibiboku.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/76579834083.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/31173785105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+night+of+2016+watch+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FE 10856 bytes
SHA-256: c32c34562483712e1c163d90e70de09cd2ad2fb44c6aebd9372a56094794fd52
font_01_sfnt_off0000cd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD30 14732 bytes
SHA-256: 89a0f868a6bc3b179809baaea9f7446f44d2b14488eacd01527df1ce149be811
font_02_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1