Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7f3f3d46047170…

MALICIOUS

PDF

86.1 KB Created: 2021-09-18 06:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63910d6ddc9dae494de4cac99dc5ce44 SHA-1: 0b3850762b1e8ced41db98db0717866ab0803fba SHA-256: ca7f3f3d46047170eaf97524103bd125ad4bb55bd95ea88904afcd6bee408c9e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to compromised websites, indicating an attempt to trick the user into downloading a malicious file. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a visual download button further supports the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://saringkarnwood.com/UserFiles/file/5423143142.pdf In PDF document text
    • https://partnermind.cz/images/files/xabog.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/xazusupupilixegix.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/wirefaferukegidig.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/91403455329.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6c0a836d6bb5553bedbe87781501018e/fujazofitezunakerenagiri.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/zaruwipugabunuzikatizuwip.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135454d9f2d1---lumimunaleriselopifili.pdfIn PDF document text
    • https://isosklo.cz/uploads/39082322203.pdfIn PDF document text
    • http://showpelec.com/data/file/20210901_214356_941.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/16677898577.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/wakiwijefoloxulojumapubeg.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26e91f4a3---69185742413.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/84323077276.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/deginaporop.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/dadarusaxesonewimo.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/kujan.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/lejuxejagivoxiwoja.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/juxupafumadig.pdfIn PDF document text
    • http://cy2hand.com/userfiles/61062532361.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/33873092313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+fire+red+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_off0000ed37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 17964 bytes
SHA-256: 7574c48a8d4b5df05b6ba426d0740261d328c73bdfe202ae85169456a84df604
font_01_sfnt_off00011b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A9 10428 bytes
SHA-256: 9f91121478b08106d2f842ee50c3acb8c54875650111890db3d05869c2d6e434

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