Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b38c263e3a4e88…

MALICIOUS

PDF

91.1 KB Created: 2021-08-29 05:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa9db5e0f4fc423b739e577300365971 SHA-1: 0107e850b6aab70c411d392ebfd1f6b729762a08 SHA-256: d1b38c263e3a4e88d0979e1d52ac40692d9ad88c77b307dfdf008e2421d851ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://jurabos.nl/include/editor/file/pumadulejovijirusamomar.pdf In PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/73295247111.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/dofutinanekaxulogax.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/6654889554.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f69f00994---30551201334.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/dde6b41f4002168558dd2c3ae6a06315/tasutanufulubamuvewipufa.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/83697846697.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/99737399836.pdfIn PDF document text
    • https://atl-50.com/files/file/benufedowarakiborizor.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dbc65367f---48794999668.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/35355957378.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607432856b481---61484830690.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/99124011229.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf701d5832---32845264597.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/samodidojamoruzafakiko.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/8djc8d1lpuimalja2mj3kb88pb/81342487763.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2sd2ugqi17kldt03sv4h9vqne6/1161789122.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/68571001167.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/jeladuj.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/guf7jp6o96bja70lbs08qf2dq0/1557892083.pdfIn PDF document text
    • https://x-software.cz/data/file/zeritokenasemowus.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/kiverijikoxenalol.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4553f07826bd578c5294f4029568a39e/nugirono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=four+a+dayPDF 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_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 17192 bytes
SHA-256: 0d837e87597fe1c982e687b4a6768723b2038867adbe6b7cc885b96a502498c7
font_02_sfnt_off000149f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F6 9792 bytes
SHA-256: 7589913884f89e60fc0f16c1eb9c639f33256f137cae0dd5192f324f9afbe550