Malicious PDF — malware analysis report

Static analysis result for SHA-256 229a4bf0c754f637…

MALICIOUS

PDF

83.6 KB Created: 2021-06-28 02:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9806855863cc51dfbf94e9ab3d54c950 SHA-1: eac7c51ec13a5682a680f8ac6e3dcb52aff1f77a SHA-256: 229a4bf0c754f637563ee46ee43bbb5c5aa17e1854ded7dfa424beb5432eae79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous links to compromised websites that host further PDF files. These links likely serve to distribute malware or facilitate phishing attacks, with the ultimate goal of executing malicious code on the victim's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0dsu0j6ulgmh5f30le268qgn71/biwupu.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d120323a---degusevewutotivif.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/77196712913.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0gik6npl2d89erg00mc7j7hl12/52034033709.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/1a1dfa1ce1ed896b5ecffa0b077a60a7/62290830735.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/55493281881.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/bda1463622e8c2603e60d2310b1e3b00/ruvuporelosugaxolaj.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774def62a2e---mepolobifovojata.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/3b58lrhr7useb8ea6slb70jgsa/31517629071.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/85469388450.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/sevazoledenus.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/sogidagajifutuxirekan.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608068b71023d---5156818143.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/zuzufogudinokixulaza.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/fopin.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/xolukodeso.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/lt9nr11ffqr5tu7fgd9upes5rg/8782828908.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aa087bbd9c15155f3ad96b6c5d1fc019/41543785358.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/20027279431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=raya+and+the+last+dragon+online+freePDF link annotation
    • https://tinyurl.com/yktmnmtaIn 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_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 10792 bytes
SHA-256: 6cec401809d82fb1ea80e3af97c9ed293c9c886063ee36edb932dfc19602032b
font_01_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 17684 bytes
SHA-256: 21c8bba32f2bc2fb37e63816326a635d06f81d80059a4f9b4c471b07ebd26ec5