Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6560552fe8be735…

MALICIOUS

PDF

90.6 KB Created: 2021-07-16 10:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a903d1fb40a40a809d953bce02d450a SHA-1: 93d2658df279fcecc7349e536d4c8381b57e75d0 SHA-256: e6560552fe8be735b29bd1a6a59262b1db62606edcd6dc56b08f728a62d2941a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically indicates a link to a compromised CMS upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.sport-konyv.hu/userfiles/file/71028077695.pdf In PDF document text
    • http://quickvideo.nl/userfiles/file/wavetafuluwoniterumuv.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dd826299de4---51202235442.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/natefefokeletonukem.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/38335423515.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/womow.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/zalibomixakulawafiloveba.pdfIn PDF document text
    • http://incoyun.com/calisma2/files/uploads/ronekinowov.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/bf31ca63f55743f1de78dfa0f5aa8a22/xaritupisizebibivajoporo.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/60228108726.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/espu53662ibho7pim3rjnmbor4/40636424153.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/mnel8lrehm376jvv0k079nkcp4/81979892773.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/51580470346.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/88539030659.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/bed04871323b847de02a65d5360e89f8/sawakakojubebivo.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/0e5ca9c7d16319022f36fc929066ecc0/2096036137.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/6itd0cvuu50umhj7ecvepc10t9/boxuvifarozavupefalukib.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/letiraxufaf.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4a1489a0334f8503d8ebae43a407be73/sefen.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/45370844899.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/4b37a22f77bb5bd5d4fe61a67071afd2/5380242413.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/80244677352.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/9569f66f5a3ef400e69a019133649f24/papen.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/lvbku2sah97s4ieim5luj80rm6/57785728181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+adjustment+to+record+supplies+used+during+the+period+would+bePDF 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_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 11380 bytes
SHA-256: d7c849c31b7258a6410d53a1c4594680cfb64ef8b0a55e485cffaf4f50b00d91
font_01_sfnt_off000116d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 17416 bytes
SHA-256: ce4f8dee9c6eca416ac8e036fbb9c2e41a10e070f58480e8e8763cda07b02cb4
font_02_sfnt_off0001445c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1