Malicious PDF — malware analysis report

Static analysis result for SHA-256 566aa24c138c9c85…

MALICIOUS

PDF

80.1 KB Created: 2021-07-01 23:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b696310fa3fc5990a9d80ad52018746 SHA-1: 0b0e1b616ea81b63e0d971437986f090be6f2deb SHA-256: 566aa24c138c9c85b5660088f4dabadca1eaab4609648cb0156b1bf99751bd9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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 http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f56fdcaad---womoxefilobotesafuwedi.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0095efe298e007d882d553187218a6d4/15906545823.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb9d189cfb---paravekebawix.pdf
    • https://tepihtrava.rs//files/51184397475.pdf
    • http://mulroyenvironmental.ie/userfiles/file/48450016089.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/95383888462.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/77f9038d5632e8cfae5b19329eb4e34a/bawodesipinorutiretife.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1mhqkt6m708u3q7ahu2kholgdl/23300553758.pdf
    • http://m2m2design.com/userfiles/26827108121.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/nafironuxatunanevasera.pdf
    • https://musikkursus.dk/userfiles/file/wenujedezonodi.pdf
    • http://carnow.jp/js/upload/files/39926574043.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609815fc68677---8159779746.pdf
    • http://sequirk.ie/userfiles/file/gekekasoxuliline.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c98fda8c515---52820545681.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/mujifogafuwumosiv.pdf
    • http://frangarcia.eu/upload/file/kovugazijutimibezizetelik.pdf
    • http://mp-journal.com/media/file/27738417768.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608163e5eb467---jijatafipigen.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a06caa69cb2---wonosedewafawujaworuxijiw.pdf
    • https://norservis.com/files/files/2759272459.pdf
    • http://bpsstudio.hu/uploads/31784051295.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0eba1c5fd3edc54b9d37bbf4dcf7761b/62569448158.pdf
    • http://al-bandak.com/userfiles/file/kafivi.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/2vn7oofmeur06rovo5f3btg9v7/dozateju.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/cmutu4ndoq9mfsmd0fd08neh97/67804966441.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/f0u337qfcrjv4neuojjrh4sl03/fapesupotel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+remove+name+from+pdf
    • 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_off0000d868.bin
7451115450a0e5a6732fcc299ab081983a8df78484db8bb065e83c91c343dcc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 10496 bytes
font_01_sfnt_off0000f03f.bin
de56c91d8ea6bfb664084389c1aa293cd189f31f8b34261152563644774be047
pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 16404 bytes
font_02_sfnt_off00011af2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 16792 bytes