Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54ddadd11c8c22b…

MALICIOUS

PDF

89.4 KB Created: 2021-09-07 00:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e756fe1210f1a9a78c569f2ed1cf9e1 SHA-1: ca7f0ac03a4207f5eb925b2ceaeef1c3d4656543 SHA-256: f54ddadd11c8c22b5085635c5b18530ccf7fb249a4640723d035ee7fd5cd48cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads. The presence of numerous links, including those with UTM parameters, suggests an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://radiosmile.hu/upload/file/kuxaxesexowenokeva.pdf In PDF document text
    • http://good163.cn/Uploadfiles/files/8887460219.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3157e95410---84634373283.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/nikan.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/feposalonogusikonifanam.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/senilubisare.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/17617470583.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/vexeretevilaleriz.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/f6ek7mt7k8qa6i241osc5djva4/61823029786.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/128806929.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/14056563950.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/85528225263.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/wavezovakudodabene.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/35880881424.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaddbe0dc5---kofevirekirafarirud.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/kopolab.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5cdeaac58---54593784855.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/zizeviguv.pdfIn PDF document text
    • http://proxima-design.cz/files/file/97077002628.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/kamitatumugalesipusimeb.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca1a6cc06---68371379785.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe7bf1df9---xuveludefala.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/sadelididopi.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/73c8543fe67e527ff3b5edab0e28d7a8/87505062997.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/52156095439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=natural+language+processing+algorithms+pdfPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/16327397519.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_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 11144 bytes
SHA-256: 057de95ba06b0fbb34afae88cf78892fe286efdb63efc3fd437c5e9c014fdaa1
font_01_sfnt_off0001104a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285C 18588 bytes
SHA-256: 827ce3175c7eeeb182ac7df68ef6cc56f86b59ee77c655509bc60dead50d8cff

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