Malicious PDF — malware analysis report

Static analysis result for SHA-256 4372da51ff8e8f11…

MALICIOUS

PDF

91.9 KB Created: 2021-07-09 14:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dea8dbb46ebfd5dc329d5d4eef45f51 SHA-1: 8f91acd44500c264138679680d0fe7d16fcbaed7 SHA-256: 4372da51ff8e8f116eeba0ec784121538227aa8aadd15d64c851af4ac256a9b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings, strongly indicate malicious intent. The primary goal appears to be directing users to download files from these untrusted sources, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://megat.pl/uploaded/fck_files/file/88047237666.pdf
    • https://contabil-fiscal.ro/mm/file/lasolivujido.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/97306045443.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bae8dd877f1---81418168976.pdf
    • https://tecnibat.net/uploads/archivos/wipum.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mf8vkkjrlhmptljv07ui204o85/22850412969.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/43244324600.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/kni74phqotn3ihdtg3v8mo00r8/16214569796.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/53783258164.pdf
    • http://anaminfo.com/attachfile/file/sabomevolorolavopi.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4be706d160fd500e51179107dc79fb69/33299373198.pdf
    • http://weddingdiy.cc/uploadfiles/files/20210605_023249_7948.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb87ce76c6---zizunibuzejobatirube.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/523dcecd4478f4f7124c60ce580b9ded/sinalewixubudekade.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609878d1343ed---pazut.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/4a162601e4d6a7e8cec152df552c12a8/67025895929.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/uqtqni1j0bqcrc3ln1ubdju900/46204206018.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee639cce6e---71700500590.pdf
    • https://benqmusicworkshop.com/fupload/file/supodisesi.pdf
    • http://driver-jazda.pl/upload/file/86099139233.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d70af3bfda28cb361d2a9b335b78b8a7/fawusurafovozemilateluje.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/menirojanuzozodovemid.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d2fe875c49505d6e23ddea3187aa8356/8480777214.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075f997b459c---towepapuledunuwomavu.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160835270e1438---48666973884.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bully+anniversary+edition+full+game+free+download+for+android
    • 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_off0000f344.bin
267466a986237405b6954d50eb806e91a2cad19ca48b8d19c828d44b4286da20
pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 11116 bytes
font_01_sfnt_off00010d18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 16792 bytes
font_02_sfnt_off0001252a.bin
ae87d5456f1c35314b4cdfc7bbf4ddc4ff8650866506871d4b2e21d86c69db8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1252A 28748 bytes