Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3b6ffaf1817cc7…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 20:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c30909fe7d190f27359dd91872526265 SHA-1: 2fdd7a0f8e35c938140674112c59127294f2f24b SHA-256: 9e3b6ffaf1817cc7c42c7a1f330b4b93c9cd5d87a2fc088e026bc17fb175ca7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be part of link farms or hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, and the document body was unreadable, but the heuristic findings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://allytemp.ru/uplcv?utm_term=iptv+lite+hd+iptv+player PDF link annotation
    • http://polipack.ru/content/file/mogakekusipovufiwe.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210926183034_u8gcjs.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/27074275671.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/66227278990.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/telusunirumofituwodogan.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/fozebinutubipumatugekotux.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/doxakipakikibegakimojadop.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379aa270f8f---74590789595.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/gixosufareli.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/81460051299.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/milagepabifojodam.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/vuwuziduxef.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/boxit.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/91173395273.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/e0j186b99angm09et17lqaecmi/topuwapafot.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/chhsea0rrovbr9oq643ekh7dp1/91545007477.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/12675500779.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/77414050816.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/23246533162.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/91900025923.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/mopisegerukutiwod.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/16729741055.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613685c9eed08---6460506060.pdfIn PDF document text
    • 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_off0000ae51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC663 14704 bytes
SHA-256: edbb7e15485d4acb456913459298cd256020c21117e801fe1e4271c4a7705c24
font_02_sfnt_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 10228 bytes
SHA-256: e6f2388a98e70d20d1738500277c80ad04dc0bad219ee6b4b63b19727bd8f852

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