Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcc0705331355e1…

MALICIOUS

PDF

94.6 KB Created: 2021-07-30 12:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cdca22021697abd3ee1d016a418e91a3 SHA-1: f783f6cc67f576f13d15da97db48f8fa2ab888e7 SHA-256: bdcc0705331355e1d442b0f869c771b892b83312854951f7060fa929a18d1101
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ee5e234a9---kebovurukarodanop.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098378e2e3bf---jowetadezi.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/1134717508.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/dujebiri.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/89249382589.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/tidabupevisakizega.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/65475929752.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/tazasisadisogiv.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e977d07491a---12505069946.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63505080e0---37070550829.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b35a2c9c0d0---46976485199.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa6252a16d---kumamul.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/91771282686.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vbh3gfu8u2u0agdhq8g1j6dnn5/wekuzexonexipusudu.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/h7nbcn1cnk5lpd6dskcc5boeit/larokukituxogusugonexeb.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/15362391457.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/74243410059.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/37565732983.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/31b16d93f5020ab23ae935290e25f995/16669030479.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/lenevawuwopamaper.pdfIn PDF document text
    • http://congtyvima.com/images/Download/tifokudajuwukanebogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=barbie+doll+values+guide+bookPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/mewalowenupi.pdfIn PDF document text
    • 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_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 10672 bytes
SHA-256: cb86e59c7bb903b5eb7998934e12d46e1ea5e6683b7e2497d9035c4b0b56b820
font_01_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC3 17964 bytes
SHA-256: af826594df6c8abf18a17eb808d6e42a31bf8008f3ddcd888ddcf67ca1de665e

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