Malicious PDF — malware analysis report

Static analysis result for SHA-256 346a73093a9fcfcf…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 21:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4c37578ee673536918109d594d2667c SHA-1: 2aa84c8b142e1e9e56e5a01fa234c74591272746 SHA-256: 346a73093a9fcfcfdc661bc65e136a33c06f402c0e2a42d91dfea616799fff4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://cructi.ru/uplcv?utm_term=wifi+calling+in+redmi+note+9 PDF link annotation
    • http://impactpluslearning.com/ckfinder/userfiles/files/kuzisakedikuxaboge.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210905134745009502go6vraetoxya.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133faf477590---betupidijulodu.pdfIn PDF document text
    • https://papiratisk.cz/soubory/gogaruwobaketemegupiwa.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16139864129122---9329295583.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/21741452155.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/44509967106.pdfIn PDF document text
    • http://geraldinekilkelly.ie/poduvakomixavegup.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/55819128377.pdfIn PDF document text
    • http://rafaelokazakov.com/file/8313875245.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/befomolijiges.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/zuriro.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/bomunewilezelupofawi.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/89116324216.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/50243390739.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/92637630654.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/gobedekoxadowike.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/35080482628.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/pelidusutekam.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/98799901051.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/8l1crt6t2nald18hllcc88pius/lemixijatobuluwodigum.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/lomonaxok.pdfIn PDF document text
    • https://slide-bearing.com/d/files/febasobetazodukuxom.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/zunujuzalenepag.pdfIn PDF document text
    • http://domainecomps.com/documents/files/nenatilurekudigater.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_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 10812 bytes
SHA-256: bf84698741c06af26658e83fb16d64b406a3a02c4f0cd60eeb8da344c9b146fe
font_01_sfnt_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 17920 bytes
SHA-256: 6e768924205a97e0b91ae365525acc94f7bfeee60c1e19a9809587cf211ec594
font_02_sfnt_off00012090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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