Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d8bb2cc2a12702…

MALICIOUS

PDF

95.7 KB Created: 2021-08-14 05:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a63e156ce045c88e13ec7cb47104dd2 SHA-1: 56a00aff0bafe0899793dbbfcd0779ad79070a8a SHA-256: d4d8bb2cc2a1270264c905c7d31b2964a8d3e2169970bb228ce57d60e921b521
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many of which point to compromised WordPress sites and utilize UTM parameters, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://krisoc.ru/uplcv?utm_term=how+to+study+calculus+1 PDF link annotation
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608008177b9b5---mesulexegibokojawepa.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d90d77661---pibelamivimezut.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/60e9a576d6663795a1f3dc2a98fe9793/xagibagibijutekerosese.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a283c338c3a---zelinuk.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/46664209289.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/4h3t3bph8h93pff74ga6dhoda2/93871570476.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c343695153---posugiwotora.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16093397482716---xaxemenuxodokedatomoxaw.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/9702bb000093c6d7c38f2f13594502be/77275838249.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21da858d5---wapado.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/72430328021.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16230754839065.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849226d11a7---3420416127.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/xuvivewujikarebebo.pdfIn PDF document text
    • http://honghuibio.com/d/files/nanasasodagogixunisazup.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/50839776207.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/39907870466.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2e3ee7751---vasevovivoxa.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/mejez.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/dimugovuwoziwunubexet.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/majawole.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c98dffddce9e5466b93385d5b3968f16/42935529397.pdfIn PDF document text
    • http://edgecs.net/documents/64083680976.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_off0001129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 10280 bytes
SHA-256: 9415ba56653a6fca0a0d3187dcea88284acdc78dedf657fc4f9b92b582b022c3
font_01_sfnt_off000129ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FF 17876 bytes
SHA-256: efa678cb5dba8a816b479ad472eb0a9e326b2fe5f39f1feeccc7ca495fbdcc27
font_02_sfnt_off0001590b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1590B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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