Malicious PDF — malware analysis report

Static analysis result for SHA-256 4312b848c476aa9d…

MALICIOUS

PDF

86.7 KB Created: 2021-07-02 14:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c2042180cec9628bdd69563807402f5 SHA-1: 541f7bcd88ec5b0a7a8b929d78aa88df4a2633d7 SHA-256: 4312b848c476aa9dd65407c7bbfbb39fdaf682116a11bdd8e8d9d5139818d278
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to initiate malicious actions or redirect users. The heuristics indicate the presence of a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/6050c227378a6cc276a93c660c890c71/22852072038.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/48320ec293fd5434aebed8507ef0e820/zemofejitazajofejit.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/voxexaporap.pdf
    • http://myapartment.de/web/editor/files/folikop.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/bugesusiwudirizavamaralot.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089597590444---minotuzumodazafojejabuzo.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2950f7c1---lobirumukeluravoko.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae56292798b---ragikerug.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/e937616936b17fa5fbf3c4ad264bfa57/sevafezotofuxawofanezi.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e8cee3361249531816a87ed859f71890/27193881250.pdf
    • http://dianacb.cz/userfiles/file/ridomenegerosi.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958bce2c20d---38153764144.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/10455dda8eed102170843281342c0e41/xiridetalubopaxefunezi.pdf
    • http://ototavandosemesi.com/resimler/file/98496920924.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708258a74e4---xazozujaxotagaka.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/fonudekaluwuronevasiz.pdf
    • https://vettercycles.ch/userfiles/files/wizugusamewuzozepox.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5e98aa0b93b04a54fe0eae1def47502f/tafixinanijabof.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073447e566eb---92408342242.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608715073937f---bowamumumesizixevozafu.pdf
    • https://ludifrance.fr/userfiles/file/18617416696.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93ac188a7---nelelotuxadibekilepir.pdf
    • http://okuninka-biale.pl/userfiles/file/piselepowunoz.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/3p0dtrdanuru2lljffr8gfttk7/mizulisoke.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+make+pineapple+water+for+weight+loss
    • 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_off0000f151.bin
40a44e890de8ddd991fb0ea75440fc5aaf835a9fae49a6e5527f9231cde2dd25
pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 10972 bytes
font_01_sfnt_off00010a92.bin
677b0ab4f534d3981664502fc4139938582561c4d0eb33ce18e00f6abea46ae3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A92 16500 bytes
font_02_sfnt_off0001357c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1357C 16792 bytes