Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbb169e1f1f0e79…

MALICIOUS

PDF

87.2 KB Created: 2021-08-24 10:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7313900f85792e787ea099000ef58816 SHA-1: 32e18ae1da6b90f4fa7022e27949bb426dcbe82c SHA-256: ccbb169e1f1f0e79e9c2f090436ef415bafee059632a6055053a14075ba84497
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, hosting numerous links to other PDFs on compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The primary attack pattern involves directing users to malicious content hosted on compromised websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/3d6155e3397ed762b733cb2c2299df47/dudotuluvizobetobaka.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4a26dc42---46400178889.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9e934f8eeee9e5924f399c657e75ba53/sodovugavobu.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210708_83C0F33E03DDEEFE.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5a201fcdad45dc0f48a75a66f4d0222b/49535220106.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc30d825f6---83132960009.pdfIn PDF document text
    • http://klefmarken.se/upload/file/53912660253.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/45560461865.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/gozaputotefowutuv.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/dusoretizeregi.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/91329208386.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d467c31da9---62532340965.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/10228054123.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/960603d787ff6da89367b23743460e34/82758303727.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072621a25a0d---38809695558.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e33d719611---jezetabowusojotutamukuxu.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021628846289473.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/pifipamamunosorotobufo.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/dumedobawurirof.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/188b02a244bc898e2b675ac42d3aece2/46466696816.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/vawivizufusajajagumufoge.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5c4da375c---24047469148.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a40c36ba4a5---1744630805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cyclohexane+with+oxygenPDF 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_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 10576 bytes
SHA-256: 6f96aa0eb3ed830d4f772c66f124e467eac5306252ebe51dd6d9131eacf026bd
font_01_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 17100 bytes
SHA-256: 58669a830b253e4600d6811847aa58801bb3cb874cc897513a9c90e3fc08a2fc
font_02_sfnt_off00013686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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