Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43f5f5bfb6c6ae0…

MALICIOUS

PDF

90.0 KB Created: 2021-06-30 19:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 435e0a2264328c7af876e2be0cdcf9b5 SHA-1: b95fced030209647b89ce3daa0b64b5953f261e3 SHA-256: e43f5f5bfb6c6ae0fee359f91d68e0d6f3a485db3c899305619475e6073bd6da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://vencedor.coop/images/admin/file/veredegawukuvosumidomepe.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2246c0075---18544915196.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/i4esuhaecl015eclnpbemu8g0r/82505708556.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819b1a04f10---10228612157.pdf
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/1707601201.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a8d74fcee3e0b63871aedfa759f03818/fazamu.pdf
    • http://foto-preiss.at/upload_files/files/41208136498.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7a8673e1e831f63163dc8ac50dbcf776/dibatamo.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/5c1d522157601a3d422b7968ff15d7c8/modawasofepetabixisiwibeg.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/051fcd26aab1580557516096b455a2f4/garafaguverudemuvizijese.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/u52u5f82goa7e0d2uosqiv1kh0/205528705.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16070c72e9e734---57421936661.pdf
    • http://bulk-supplies.com/userfiles/file/74227995233.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c8a3a4fdc---vizigotavozefupokififot.pdf
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/40943057343.pdf
    • http://spreewaldatelier.de/img/editor/file/bumune.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4de487729df70b3a71c7258ed2c42a22/ralunujexubarutojumu.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160863e3a15784---fijetaxinojavusono.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91afb02198---73678909670.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607516648c854---savalotezole.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/efc8d982734cd3c42e6ce97f00e381dc/vododopisi.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c32fffc6437---50030616301.pdf
    • http://heninrealty.com/userfiles/files/vosowu.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fe52d5f75---zarulezatujubemezewekixi.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/pozapiwojewireseveloki.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975dac9087a---lanebatasewapepadod.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hope+and+history+rhyme
    • 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_off0000fc10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 16792 bytes
font_01_sfnt_off00011427.bin
2ba2e6f21537fec084763cff25209cb27789650975f63d0a5cf7b57d3048f616
pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 10716 bytes
font_02_sfnt_off00012c8a.bin
d475cf48a634c67d7063cbbffaa5d319540c42d76c8eccde31b42d20d93b6b61
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8A 17024 bytes