Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db570cfd0a72065…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 02:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df0f7287be1a447e32cde3bd20804a32 SHA-1: 8b25d70320980f8b0bef187ae74ffcccf3b99d74 SHA-256: 5db570cfd0a72065ac6e7457271c4619b25e07d548c7816d443372d14e76b37c
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 upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://arch.ua/ckfinder/userfiles/files/volopo.pdf In PDF document text
    • http://mgtuae.com/uploads/file/41920187974.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/74149634019.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/diwelazagedifefudemukub.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2cdfef4114d90ee80ba8998b3b14414/70822541112.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/kinumijarezetaremadebefi.pdfIn PDF document text
    • http://showdoimovel.com/files/files/dewifevusurarero.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/gigonavonajupam.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/namulejirepak.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/bupijuvatisi.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/56260482927.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/tabebugafunega.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4f3bc9df---bakivamubamasepokidaxipu.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210918_232405.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/44667867485.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/10286367977.pdfIn PDF document text
    • http://generaldistco.com/images/file/52969256315.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/28029381285.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e33bdc2b8---fipavelerenijomi.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78687440783.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/sukapevevuzulale.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/32744152198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=adjectives+beginning+with+gPDF 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_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 10624 bytes
SHA-256: 983decc9088a858da169a584fcbde49dd98bdfc843d7482458d2904348b6a397
font_01_sfnt_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 17148 bytes
SHA-256: 9352a8dc094ee720041ee8e5bfb0ddfdd451f740a087d58a86fe5d4cd5ccbaa7
font_02_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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