Malicious PDF — malware analysis report

Static analysis result for SHA-256 a256df8047dfc376…

MALICIOUS

PDF

88.4 KB Created: 2021-06-29 11:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9360333bc918a6467a6ae01236f474ca SHA-1: 877167e57c9ca71f0ffc8c51a8ef58fe560245eb SHA-256: a256df8047dfc3761ebe46b3068f90da2cd3cc221673801b45a50c137df74b99
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://ppuhperspektywa.pl/files/edytor/file/55039810102.pdf
    • http://sllight.ru/design/img/upload/file/3826822964.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/71e50bd8a1eb5e3afa0f6501dbda9628/32394326580.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mod6a388r55rp3uqu6eiharp2u/xiditokexigolodat.pdf
    • https://paklya.su/design/img/upload/file/94827230186.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/misagekijanebuzidufono.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed7a6b7d64---25043404629.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609617201fb5a---97070240547.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/kp4r293hqa2e50g1mgp9b04vsr/96911273869.pdf
    • http://szentdorottyapatika.hu/files/89060207652.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64bf595845---bupurininelixof.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0391727657---45526702908.pdf
    • http://csc010.com/userfiles/file/20210625233415_g3m7p8.pdf
    • http://mofrantech.com/userfiles/file/77217576519.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1a5edab4---vavozoxa.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abe5f6adc3c---77758830936.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabf1542eb6---bijogig.pdf
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/6451656903.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/sqbi3pkkeoa3qcju347a9r85cs/44703113356.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d95c75720a---rewegadebovosiluw.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e616c9e012---41863829428.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/24136276531.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=deviance+in+tagalog
    • 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_off0000f1fe.bin
d85765564e124d22736ae2642c15dea854cf99fbe031963e45cd8bc3a12e0cb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 20324 bytes
font_01_sfnt_off0001258b.bin
6357d5b638dd5acc6397a9376105e546d13bfd2cfe617886e7432ade4dc12486
pdf-font-stream PDF embedded font (sfnt) at offset 0x1258B 10204 bytes
font_02_sfnt_off00013c99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C99 16792 bytes