Malicious PDF — malware analysis report

Static analysis result for SHA-256 607a5bc4ba39577c…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 14:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38168fa1b0256cde5202f9f49f48ddde SHA-1: 2cf74877776f5f1cef803b36901c059068683eb7 SHA-256: 607a5bc4ba39577c7cff61c28b7db436dae92bf9b69a54849c0fb888cd1e1011
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised or disposable domains, many of which are structured as a link farm. The presence of a 'minecraft 17.0 download' UTM term suggests a lure to trick users into downloading malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://brandweeramsterdamamstellanden.nl/userfiles/file/sepozupimaviwobavi.pdf In PDF document text
    • http://belloverde.net/emailer/file/25757425575.pdfIn PDF document text
    • http://freewest.at/punoropogoxe.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438ab50ada9---sedevu.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/nekuluwa.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/361823228.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/2926470004.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/vasudafaledofarelokoduge.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/56077054525.pdfIn PDF document text
    • http://rentator.com/uploades/fckeditorfile/13742407813.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/21942525215.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/dakilox.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6ab25598ee0e016c13a37e0ae6ab0b23/mumujejuzomejararipizubub.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tuvunepibojapuwolerix.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109071747507944.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/dinirinuxal.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/36452879301.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109120712549253.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/79370296352.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/6489353135.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/95464693617.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/sivugijakevuleditanonixix.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a277d9087e90e267700fa0ffb191a165/37449566014.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/gurog.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109161656012394.pdfIn PDF document text
    • http://citra.cl/userfiles/file/37752983030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+17.0+downloadPDF 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_off0000bea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA7 10668 bytes
SHA-256: a96e7eae40092eb3be7a0815184ea21e98bea0664c5e173ecfb02adefb3bf7f3
font_01_sfnt_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 15968 bytes
SHA-256: e9c94c7ad3acccd87f1b1b2940cd4af4d35a591fcdf588c843c5f8221d7aea89