Malicious PDF — malware analysis report

Static analysis result for SHA-256 309f278910634f1d…

MALICIOUS

PDF

80.1 KB Created: 2021-07-06 02:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cb72d0445b37a6b2130b2b2cff15fac0 SHA-1: 866c2553528a39e736e3096ca629281f2b768463 SHA-256: 309f278910634f1d93f229acf361eb0842b00094d57dfa9e98824ee061c43e73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to lure users to external malicious sites, potentially via embedded JavaScript or by hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://soepcentrale-dekeyser.be/userfiles/file/fojofekad.pdf In PDF document text
    • http://chukysovin.com/img-svc/files/mejixuraxudata.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/a6apuspqjhb8hahtodku1s06s9/28958066518.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/31409314004.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/niwat.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/pujivogolubisunanovizume.pdfIn PDF document text
    • http://renovator.cz/files/file/98473753620.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/86309940718.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947d34ce09f---fuzenokusiruxurowedufiz.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160710de0af6a9---niwifakabilorasibasaxo.pdfIn PDF document text
    • https://area5srl.it/file/wizozususelenowibuma.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f83b985ce---wesagebetodetisevumiv.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/13314672432.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/07c9069ef15eade48e54275858f3e7f3/topunabotivajubi.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160841d597e432---jelik.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/42293631252.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ddef4cbuv16toml0951t4gj1bt/29068733518.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160961a0fe7613---35750138446.pdfIn PDF document text
    • http://bociany.sk/media/file/mokexalinibenud.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160948483de1b5---zeseve.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/64547556332.pdfIn PDF document text
    • https://eternalbliss.net/file/timizenutagukedudunezemof.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160e16fbb8e5f0---kukefipezekipekijiz.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608974a4be364---35384074818.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae0a94faf---70278894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=stress+induced+hypotensionPDF 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_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 10692 bytes
SHA-256: b20f8dad021b3f216058388ed94bf85a9727b85d8be1087a832e34470758ec4d
font_01_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 16136 bytes
SHA-256: 708ab238c04f3cb1e46d21dbdd8263840e6694cfccb105ef8be6e4e85663b217
font_02_sfnt_off00011b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1