Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37dd2d2a4e8406e…

MALICIOUS

PDF

84.9 KB Created: 2021-07-14 00:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fa58dfa2df5e7572ff87a83ec28792a SHA-1: 2f25f7a62996d7bf45eb70c1ab7999f0dc31e759 SHA-256: a37dd2d2a4e8406e08b3abecb60255349de2b9cdcccd56feceaf015ad653b793
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16076f045b377b---zirevexuleresadotuz.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ddfa9a426---67563984733.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9cd37fddb14511a93fdb2f9e350b833d/63215363984.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1fcddc4c1b3343ecd92e7e2852e23cbd/wotatujadi.pdf
    • http://www.urbanwaterways.info/files/muzalopo.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/26557750709.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ea7ccaaf3---14770718867.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a67bd5b146428e102dcb384f703d336e/riwazimekuzirelori.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0c248cde---rininigonemezoruvo.pdf
    • http://alexlunacoach.com/img/editor/file/naxoresuwudilujopuxefi.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b731a44a11f---71508725289.pdf
    • https://kuepancong.com/contents//files/78200200156.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37a0ef2743---wekesoxeziwevez.pdf
    • http://rmgoals.com/userfiles/files/35683213250.pdf
    • https://arerp.kr/data/file///dosoxovutemovulituf.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/af6dcd46b1effc41529ba979b1797726/38522466346.pdf
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/beduvulup.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e64a71603---wexitigobapojugugasi.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b9093a2bf---luxidifijewopuxuvikaji.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/d7uu7ftbr0t6b42fuge0fckbe0/xesof.pdf
    • https://hijaustabilo.com/contents//files/wenitezefo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ideological+party+meaning
    • 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_off0000e985.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 16792 bytes
font_01_sfnt_off00010197.bin
e79bf7d357dda132f83422a2ac3528fc9638960aceb8533710a3a6c04254bf9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 17108 bytes
font_02_sfnt_off00012e3c.bin
d94c70548a6ca7f52365ff135da646fb41772e3d9cca5d33770f9002708aac6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3C 10752 bytes