Malicious PDF — malware analysis report

Static analysis result for SHA-256 becf9c87415c4644…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 09:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac41fa43cf72824980506bded9c2a982 SHA-1: eca176208c380fbed16f1ac139baa514e8cdad08 SHA-256: becf9c87415c4644b3a849334045826f65cd7dcb9fdbd6248dfd4d6e9f0316d4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external links, many of which point to compromised CMS upload storage or disposable hosting. The presence of a 'download button' heuristic further suggests a lure to download a payload. ClamAV detection and ML classification strongly indicate malicious intent, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fructusartis.com/i/File/xaxutaburos.pdf In PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/tosedubij.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/95065918602.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/zavaped.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e52aaeccd---17908017131.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/fidodobotenetupaveram.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608341842d4c6---89250015407.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/tegezi.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/25641571852.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/39928254645.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/755ec62fb2ff2b0e8a9de4d840113745/16710720193.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/55160675798.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/28454665564.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/2492fce310c9090663f900b9ca3e24c9/vulijaful.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5094c49dbfdcee5d84091f3f379510a0/80845142076.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b03adc95382---tupijizasiz.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/f338cm3ghcfadojpme9eq5ujrm/25048213011.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/zemolanumiza.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16113e4291ae1a---zekodozafidofeg.pdfIn PDF document text
    • http://www.bandungmesin.com/file/88382557423.pdfIn PDF document text
    • https://arerp.kr/data/file///paxijumiforuvava.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/c44b4f5f5e79aab18eac56227487aa71/mewavovemeser.pdfIn PDF document text
    • https://koratspring.com/upload/file/98076135744.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072809ce62b4---valesogipexebututa.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3785ae68---rokaf.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16120bb8379373---rugixatakizeg.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/23826174670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=principle+of+compiler+design+book+pdfPDF 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_off0000dbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 10936 bytes
SHA-256: e280873fbf5fbfd08a6cb627a8d975e5e696330b7ff02579f4291bd06783d969
font_01_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 18272 bytes
SHA-256: 48dd1d08ace53740742946171571f36369851d57dc47f5872c9a238b61e09cec
font_02_sfnt_off000124a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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