Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67dd73d4a44e157…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 15:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ab96eb5916b72e59f742844f422c44f SHA-1: b66c83c28760d9577136156ed083ec33c22bc1c0 SHA-256: e67dd73d4a44e1573273fd9dfd302dc90bd14a13e4358915cbf071073db000dc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://corporatiegids.nl/uploads/files/31702797245.pdf In PDF document text
    • https://jobtiara.com/files/files/69727565871.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e404ab8c16---senajexegedeg.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/xoxitugamoselitujofo.pdfIn PDF document text
    • http://metallpress.ru/files/xopadinize.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec089cc17e---50324091173.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/61608201227.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/45255210340.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/juxirelaturodukub.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0qcd68ib8mpof2r3isp1ubqn91/vamatobeku.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/rafadikatimosisux.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161354c8c31e8f---milul.pdfIn PDF document text
    • http://dongphat.net/upload/files/22371202891.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631234703.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79f607094---28140291665.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/xexubipupefasasebijet.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210910_F7624B41A3BD12EE.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/16951325470.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/89741967461.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/33922682182.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/24891917050.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/kekekafupilusoseduduga.pdfIn PDF document text
    • http://indemo.pl/Image/files/xafanadoximuriga.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/6852435384.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/gujotoduguwer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gry+z+pc+na+androidziePDF 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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 17628 bytes
SHA-256: 5aba5c0fa19d571e66b6fb271b68ac5c7b464b7f48160a38e2ebd6f8c466c0ca
font_01_sfnt_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12817 10408 bytes
SHA-256: 51b3399e8aaba3fb5f13e53100d524aa85f2c9e6149177c2f810a1246863b8ed