Malicious PDF — malware analysis report

Static analysis result for SHA-256 3251011de1c83b4b…

MALICIOUS

PDF

107.5 KB Created: 2021-08-08 08:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8de63ebc90b74154f06aaea54ea1042 SHA-1: 4b7f02cbf335bbbc17dcf8ae3f1530908bebe4fe SHA-256: 3251011de1c83b4bedb035904e7d3e70cc86efe4c294126986ea6906cbade596
224 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URIs pointing to compromised websites and IP addresses, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af594d74db---43073493060.pdf In PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982ff897a87---91710869884.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/258f79fbee33f25ee86805d4b0ecc5a7/zefolulewavirikutaba.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/01v4t2ge29hf6urpi0krmhosfe/21168492225.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/xobuvulepanizavevidamiw.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/5525292419.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/90068202956.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52778c1d4b---66594875553.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/5277514790.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/51325921375.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/bibefemum.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/24122453751.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e0efff93a8f---81404575055.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/6392566478.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/31d3fbae7264a47c8b3ffa6b404486e2/13958504153.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/bululazu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad33debdb---degiwunade.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/puwexixasosizedukexoba.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f91a07177e7a9a3f7352f3820711a2dc/sevemumabe.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ud1i2vdg44im5j11p8b9p84hd1/35157769426.pdfIn PDF document text
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/ragix.pdfPDF link annotation
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/milugoniwapetifogax.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tuptm68t0c2cgem18s5pkbk5v1/xakulabisawuzefajula.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/4fufjp57nc3pa2m1mj1olqkghe/20256675882.pdfIn PDF document text
    • http://kindervakantieweIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=skyrim+how+to+make+alchemy+potionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D1 10840 bytes
SHA-256: 6d051252ee3ebb674ee1e354aea011c08f958dde2cd9e075d69e578a2c6301fb
font_01_sfnt_off00015aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ABA 17020 bytes
SHA-256: f9fc390b55e03e320d74898d6390fa5764ae84d7332d076c461b289fdc7507f7
font_02_sfnt_off00018752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1