Malicious PDF — malware analysis report

Static analysis result for SHA-256 282504fd073b408c…

MALICIOUS

PDF

86.4 KB Created: 2021-07-26 13:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d4bf126cef6abd589ead4cfeaa718e3 SHA-1: e7219f995cbb34e8bfb1f1a03c5453f458edf962 SHA-256: 282504fd073b408c990f9f6742c0b486a50f38cef2def84da85afbe06084985a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e055f6dcc7---89793736142.pdf
    • http://cdkkck.com/uploadfile/file/20210624215031.pdf
    • https://tanthuantelecom.com/upload/fck/file/91364412806.pdf
    • https://aawyx.com/sites/default/imageuser/file/nenogifoxanavekejuxu.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee18bd6278---waxota.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc85c71e12f---74768179374.pdf
    • http://btc-ltd.com/upload/file/48073037052.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/kpcngr88dbcl4m80dpd7a62fe5/sifasaxovogonabixuwug.pdf
    • http://chothuethietbi.info/img/files/19691231010.pdf
    • http://asja-doll.ru/userfiles/file/344991770.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712158b66a2---nesisupurakebenoz.pdf
    • https://imahima.xyz/js/ckfinder/userfiles/files/10472615412.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba976ec5cd---babijatudoxel.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/me5re4v6djekuq53l0ujbkb39n/filuwuvololi.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/602c6ee6ce3a086cda22c05cf99b6b33/xomuju.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef12d1c658---4703745672.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c3bb3b346---63761673565.pdf
    • http://phongkhamthienhoa.vn/images/files/vasizozolas.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/70518123985d9f2837f5fb599166328d/1509202771.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160862226df312---pelupilof.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160771f225a938---76210269763.pdf
    • http://ahchala.com/img/file/xigejuwigusinipera.pdf
    • https://nnt52.ru/userfiles/file/26483973465.pdf
    • http://daiichibus.vn/uploads/news_file/xebusesizonivunafi.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/35111582915.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+much+is+monster+hunter+world+iceborne
    • 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_off0000ef4b.bin
fa56e4084041a4140d0cf6faad624b56cb6d393659a1e6819b991775bf5787b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 16604 bytes
font_01_sfnt_off00011aaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 16792 bytes
font_02_sfnt_off000132c1.bin
6f5e0fa7002e0ff29d749c03d13d11aff0be0d1f0a3028d45de01ebadf77ee64
pdf-font-stream PDF embedded font (sfnt) at offset 0x132C1 10792 bytes