Malicious PDF — malware analysis report

Static analysis result for SHA-256 075a6d496762900e…

MALICIOUS

PDF

82.8 KB Created: 2021-10-08 17:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8585f4eb4ff2195894f3cb85883c027 SHA-1: aca8e7bf74427b66f00e9c99231afef0f0acd7c3 SHA-256: 075a6d496762900edc90ef19e6afbf4c7a099f79336170f800d429ee087b2dd8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

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 http://skoleniridicu-online.eu/ckfinder/userfiles/files/52398801534.pdf In PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20211007_7D0FDD2FD2452E2D.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/dalejudir.pdfIn PDF document text
    • http://ipceurope.be/assets/file/vogevadusiminiwirifow.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/13477321709.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/32885676484.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/60048184106.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/wefepusirunuvobekuw.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/6176755361.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614d852865c9a---podofepozivubegaxir.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109301950548213.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/rujibalaxevezow.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20211001075912.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/580ivp6ditb6tflo7dnps8o90q/33708480390.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/9542937680.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/11551078538.pdfIn PDF document text
    • http://novichiha.ru/pic/file/69936194942.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/jejusivokasezijasikusope.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a0ad0a4f923578c0bcdedd424da8961e/dimexixew.pdfIn PDF document text
    • https://ksboutlet.com/file/files/pudigogokafetedavorap.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/winavarixib.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/89743901f9ad2c6907e81aa76f390a31/15524771586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=glimpse+of+hope+meaningPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/53091244263.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_off0000d952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD952 19344 bytes
SHA-256: 45c0546b2812e05021d1225271a353d6cdc7cb1e4d1604d4c12fb30d337b61bf
font_01_sfnt_off00010bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 10644 bytes
SHA-256: 76222a593d083ae526ba9aa980cd61fc129bea194660e47ae374b9ac808a9f84

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