Malicious PDF — malware analysis report

Static analysis result for SHA-256 915c9e9f54a7a036…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 12:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf181ff70aaeb1f37416efeff714db3e SHA-1: f10f331df89923def1daa76a9b26916f7ee87b1c SHA-256: 915c9e9f54a7a0362e09bbfbb2efe5bf3bf1575c9347d073b1b9b3c5b52f3e91
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed for malicious redirection.

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://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16082a7ab61d50---sinedeperapitajibugaw.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5035ef3662---webeb.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ig82269g0co1fvmc8lousqq9tj/sakewopuzojarufuwixividik.pdf
    • http://gazosilikatnn.ru/uploads/files/84320392875.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dabaa216ab---divixofuwenefabasasosa.pdf
    • https://inifd.london/uploads/file/suparipar.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b83fb3fa28---93141177093.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf7c2fbac---tupuwukovoban.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609825a63e256---90167976450.pdf
    • http://builderall.info/userfiles/file/fanure.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210605044402.pdf
    • https://machnhaduong.com/images/uploads/files/woxefodabubumivanago.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607780cec0e30---manupuvefafoxa.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b7ae1bc4e---jijumewepoxakug.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7ffc897be---kepekafajijobaza.pdf
    • https://steklo-shik.ru/userfiles/file/14188179282.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ab01e64f943d9d5e9c4e4685b9cebd25/65307691158.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160884a6eced95---wuverukawazuro.pdf
    • http://bualuang101.com/backoffice/upload/files/fapagolofatuj.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/g095s93um68bh329hkugogcnpc/gafenexenalabewuwifofisaj.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a371468f156---3047461959.pdf
    • http://musorcentrum.hu/files/article/file/koguti.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/8e1d7d562c9e36ea1e668cc9c6cdbf18/13031307913.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c645e2ba0d2e292593b6ea69ba3318ff/37089291163.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/mgrp4bhhlgcrd3jgvjep2ghb07/nunojixobuba.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ukobcnj5i39fffqkrrctitjrum/33803275375.pdf
    • https://efnnma.org/files/file/21029945060.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=apostrophes+around+a+word
    • 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_off0000f014.bin
4ee228b282556fecca134847d454227251eb33bfaa5e62be55d84264c2eee2a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 10516 bytes
font_01_sfnt_off0001080f.bin
0960bf3567093f14768d9cdc9ea18c101dee89d5b46299d578ad6626392c83f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 17736 bytes
font_02_sfnt_off0001365c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1365C 16792 bytes

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