Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b10836a1b82f0e9…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 20:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ee41860f374f49f9360182d6e9b1dca SHA-1: b02b4ada3f5e6fedf3a1d72ba524a29cf5530b97 SHA-256: 9b10836a1b82f0e9e3ee26a27cf08bad8d9e6f440a6036b44dc24b05ab5a390e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains embedded JavaScript, suggesting it is designed to execute code upon opening. The numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • 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://morgancountyoh.com/userimages/sivetejiberaz.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161471f333e33b---fivebemotubibogavuta.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/59659565649.pdfIn PDF document text
    • http://ternovykh.ru/content/file/58019418674.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/96857136010.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142d0340ca2a---tomijirobar.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140336269cc3---85097271734.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/72199297317.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/jikituzufinoviseb.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/74696379945.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/87243764536.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/33110830087.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/golupojogaxaluredewa.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/rutagodibesadaninosi.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/tuvigaduzodupulumexamegu.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/moxedanijebewepugemaruteb.pdfIn PDF document text
    • https://zzhqhi.com/d/files/23629733543.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/40661182645.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/16510624685.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/59264251084.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/91798203300.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/tikojuras.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/sigasuzulaxixexakis.pdfIn PDF document text
    • https://fishuntpesca.it/file/jijifofax.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148d8d2a7574---60776008882.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/9801922155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+cut+audio+in+androidPDF 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_off0000b58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58A 16676 bytes
SHA-256: 2a0b6b6d9962258feb1838b4cbf4abb978383ec30dff8ca05cc81fe9d3004abf
font_01_sfnt_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 10192 bytes
SHA-256: 6df47ec1851ec59037d12aa4854316f3d51fb9700a571959b122bec6f85a45ab