Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f669ae531a834f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 05:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 10ee76f6d1e526c9db29ac8a9e79c802 SHA-1: 4d831c40d348fb7414c1ea699808e229c7c725a4 SHA-256: 13f669ae531a834f1120f760c640a6743a3ef0efe3833d9262382d7383b53b74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a4191a91---jadomovapixa.pdf In PDF document text
    • http://www.vikingmaterials.com/img/lafategedufoporoxibok.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/jjjuh723jco5emqlent6k7kuu6/21768390784.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/bs9oebutigsa5vrma457cdkgat/rupafazabiwanowu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/62421220818.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16107d5c08c33a---kofujazigax.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/wezekojesusalipaxefudofe.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/57797207705.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d18eedda19f---6065604966.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7bffignobgcvesf03asc60jc6p/9337413380.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5f7d574ab---57941215094.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/38979434032.pdfIn PDF document text
    • http://nktrading.qa/file/files/44964777974.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/bojidokir.pdfIn PDF document text
    • https://linker.tw/files/korerovugonamalip.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/tedubimevutulerapejekadi.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/29919256156.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/32486451130.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e60ab12049---96654902012.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6cfef920a0be3f313288ff5fab71f17a/6305388489.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094aac077822---89039950387.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/kijusetej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=world%27s+most+expensive+stock+pricePDF 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_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 10800 bytes
SHA-256: 2ebbc7c07c165c77dd1b0a40aab2953af8d805f1bae622a128b413cbe163e00c
font_01_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 17712 bytes
SHA-256: e57578c774a6b6629563a57dc99c9bb2c42bb25fe98947a0a4fddae5bdeb4047
font_02_sfnt_off00013292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1