Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a8a868ed5c5e08…

MALICIOUS

PDF

87.3 KB Created: 2021-09-03 08:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: da00cc54dbd66df2d8663fcc25a7da83 SHA-1: 3354edff39139314484d28b628a393a7e93cba15 SHA-256: a7a8a868ed5c5e08e15b83f57d9f0a80da9ce2a7cd69640c5ecd4700c0558692
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b597d378e1---74375192965.pdf In PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0fd12c64---78042780441.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/sopironazujuliwezi.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/mazujudidep.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/32575510524.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27047ef66e---79047365013.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/lebokuwiw.pdfIn PDF document text
    • http://lyshiying.com/d/files/13763465093.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e48513fec---1579452200.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/mokesonobu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115601fa90d7---torur.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/kisilokamigi.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/3sfgqh9ftf8t87dto9hhum6mjc/55354063260.pdfIn PDF document text
    • http://annabarons.com/files/files/nobuxesizovibagujojukibo.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109010007025112.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/dclvt68lgh7hkvbpvesrbi1mdu/wazupukugavivuvaj.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/11003421656.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1731aec8c---80220580469.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/53078973707.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/93051156386.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/28839818643.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/e53acc4391d697b5c892d21e7abc8c4c/74518600011.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/10694203130.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/pifomiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=makalah+isbd+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_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 10264 bytes
SHA-256: 812c4d2b46962b5f768cf3d2b0c9b953e0c8ee186ed653ee44fc86115f79a9f4
font_01_sfnt_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001210c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210C 18516 bytes
SHA-256: 625feed2075d661e06891f22f60c3a66ea128c9def0e90bea703611888169f1b

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