Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ac6f0d4827c57f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 07:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 211918ab1dcba7f2136f5b321a579497 SHA-1: 9417b065c37b9933825cb4e413b59c4469d78b66 SHA-256: 80ac6f0d4827c57f278c3766de1c7c3426f98898a3b45699a25d27785915711e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cheesykeju.com/contents/files/67655860604.pdf In PDF document text
    • http://vanharteyoga.nl/uploads/files/4446000485.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/dd9612f01580e41b1d2b86413db98c19/dusivogafikufinaj.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43777987955.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160705f5a61f2e---27636464099.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7qpbdv3754bph3vuoli9d1h302/94573803665.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/25977444028.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/la2plcbdet9uqc2r6e9kqbsr2r/57604603268.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba23d3472---polukomopinagi.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/33832534248.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/o2gcsnbi9s9131jos1md6jcq2p/fibori.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/84379664808.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/54361968959.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f3d61c366cf13f0b0d9ee619fd07dd3e/95519426087.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/kosowipixugosukibavosewip.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9fedaf26e8c2e5dd8207729f53c40c42/tifovijisitezowu.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/lotifususupefipo.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160731eede0c02---doxazefupib.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210617_030152.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a34446bc40---jefigew.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/33197140330.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/kovikixowezelijexur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gearbox+parts+name+pdfPDF 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_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 10804 bytes
SHA-256: be00281ae5dddf6f9ec3d30d445a20ad12b4e57d2c5536ab2b3feab3c3c28deb
font_01_sfnt_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 17744 bytes
SHA-256: 385df610b9a017710fe84ee1ee55b57799a800f5df4d2a728d1aa942b27f09e7
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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