Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a37eae1fc69bd7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-22 21:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1551a20cac5ca6237b68182bdba22a4e SHA-1: 6e46e2f96966d8caafcec442240c8b49ab8246d8 SHA-256: 04a37eae1fc69bd7508ef28c647289f89f9ba4799196e7006f2a5b761c950c5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6200

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://racecross.com/upload/edito_fckeditor/file/wudunoraxugurupikox.pdf In PDF document text
    • http://thy-environment.com/userfiles/files/37247382302.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/53134274788.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/5661046368.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/34409787003.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/38283357276.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a05ec068c2---50982003119.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9afe0401f8aabcc78dd52efc39759af1/riwezenilebis.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/topanigipinesebepizusewo.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133db96daeac---ledajejitenakek.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/zozuvekogafulikelurosox.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/50642885581.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/varugufoja.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/lujiluvasurudipabe.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210908_F548DD83262C042C.pdfIn PDF document text
    • http://my-glc.com/uploads/file/bavom.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/nimativi.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/miregebirinaxuzopogirigi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140e89ea2a30---vezasatow.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/29870237190.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/wafuwav.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/rirawukulesufoxarotix.pdfIn PDF document text
    • http://freeski.hu/freeski/file/rurawebegupesetize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=r6s+game+passPDF link annotation
    • 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_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 10248 bytes
SHA-256: 3b0a160885395d471976995af1c7f86cdf55fd64b8c80daee72ac8eb8aaa75e5
font_02_sfnt_off00010f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 18056 bytes
SHA-256: c0d6299d5cb4922e01a0b51536f13762bfc73d3b1cf6eb2f349182913edce4dc