Malicious PDF — malware analysis report

Static analysis result for SHA-256 071ab197ba5db3a0…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 15:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d198ee4cf46b7cc59545d9eb3041430c SHA-1: b54fc385ef7565ca83f6318412ae2ee97da5f093 SHA-256: 071ab197ba5db3a0e58d4b8eecefce57542bf5d8148ebd30152f01f425e5be84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a256e4bfd4---lofakidafirutob.pdf In PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160871c0f8a5ea---29982438297.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/wamoxobivisulit.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a0752c9b399---xekavu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vavane.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/54768471388.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c091e0e8aa0---podomopikosajivimilapafuf.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f258f27f6fb59812d53974330d674167/rojinokeganegoxujasaxud.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/64i5d0g7u5veuo0m2suge1r43n/kudufidu.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/25369756621.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/koxopexaxovijiw.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/nenul.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d50e08ed8c3---97746122140.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d24a2187132---dufeki.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160894479b6195---xasadux.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cafcd08a731---51370153048.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fe75cdc1acf---12788483309.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d7d1579a9194d636bf4e8fdbecebe79c/mowatizojazopugizimuven.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160946c3c5f9de---luvafawepanizarimedex.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/oqvpa67lgo28kqt4tqdcqqk0kn/75429227962.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/o5frr6pqof2g0261bd2l4p7ugs/96035223970.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/73tcgsfh9ocp8po1lutukp0bt4/xulisuwaminisijososarunas.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/vuvizekemetom.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/75222791640.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210730_6FA21B55B43FEB3A.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/j4t5dojdvggv9s9mj60hlr7ia4/21480350299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=coleslaw+and+chickenPDF 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_off0000e076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 10476 bytes
SHA-256: c52df7aef1e3cf52428035a1621e446b0569075a2f3eba98fa205b05d2bd0f16
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 17292 bytes
SHA-256: e28f1609bc086a7f3e8e197dff9c81c87dc820d31ffb4e74bd5050324ad6fa47
font_02_sfnt_off00012551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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