Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15a7e1306ab7176…

MALICIOUS

PDF

72.2 KB Created: 2021-09-29 08:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05203686c8e326d2053745fd90eb4ed1 SHA-1: 49fdcb144e53673d5e709a7122ca49d46d6096b5 SHA-256: f15a7e1306ab7176ae196601a318a4e9f0510a7bb4949663b932138a3c5e8e35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates a link farm hosted on compromised WordPress upload storage, suggesting an attempt to distribute malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • 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.
  • 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.
  • 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://nawaress.com/webroot/js/ckfinder/userfiles/files/15050731939.pdf In PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/37268775860.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/s67bcn80mkqgh3klukcnrc8dkl/44540082731.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/67891165268.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/15556903911.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/vintkldss4cs18k6v8aqkcceb7/xamasunitop.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/joviveritumazed.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1851ed0ec23daebef3f200a0fc58405a/70654299801.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/17811314793.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/55752210176.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/78679836786.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/53753075177.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/21462675543.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/9044632140.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/74039396676.pdfIn PDF document text
    • http://bankerz.in/qpic/files/83618192804.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/vaguwusokixew.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/8805008101.pdfIn PDF document text
    • https://airxps.com/userfiles/files/waxif.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/zujipiwabovuge.pdfIn PDF document text
    • http://garderoba.sk/images/_file/51113608007.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/jemujatofawuvisawe.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/pitubonabaxufiboramatap.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/pipalafid.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/61426035683.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/63bcd30d1cc052bc161e3d461fdb8ad9/foxufigituxonewiw.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/kanesisuref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=samsung+themes+apk+2019PDF 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_off0000b55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55A 11072 bytes
SHA-256: 43df454c80af67c6c7ccade2add6b5ad7fbcabe3cf333992fd79bdd89e2bfe60
font_01_sfnt_off0000cf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0F 17156 bytes
SHA-256: 09ad7f089cb45fb79100beb241f934a6cc4bd35f8084f506440f92615d4830ac
font_02_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1