Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c88eae5949eb41…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 17:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24a5ab822dfc3c90c4b5ab306cd6a4a6 SHA-1: 50f12fc9b8c5a34fd1298f3bd4d692f350efdeb1 SHA-256: 31c88eae5949eb416e0d65f8b70bfc810f142c6b8cddb1248624723792a05d2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the URL structure and heuristic firings point to a common tactic of using compromised infrastructure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://wastran.ru/uplcv?utm_term=online+file+converter+xlsx+to+pdf PDF link annotation
    • https://wodepcb.cn/uploadfiles/files/84041306279.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a871dfb919c---tarafapuzasetanusexojam.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f95ea3e6e2---27231224487.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/ninexik.pdfIn PDF document text
    • https://hoalavender.net/upload/files/73193822466.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a83262c70c1---kusagajowisediposaned.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67f0771a40---99746297704.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/84326308727.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/77094567865.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/22203919516.pdfIn PDF document text
    • http://techbis.pl/files/file/24070814740.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/pumifuv.pdfIn PDF document text
    • https://sfilatinogourmet.it/file/ninabosibivusidusijogu.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/zaledifedufesap.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/75871142940.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/kuzodolanimusewezizixe.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/topuvexamekedatekirut.pdfIn PDF document text
    • http://hotechike.com/files/files/tixogitasupudosupijonu.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/48613801633.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/zofajokaf.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/pimimef.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070773a574d6---14828637561.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/66518287775.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 10644 bytes
SHA-256: 29c8b36035808765d83aa1bb6e567e4b47e47e93e04c4e01c94322b54c360b01
font_02_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 17056 bytes
SHA-256: 779bfd6d1100ea6c73f3fc4c2d63b85229a40c4199120a091b6ecdff9281a829

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