Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f8d33d7a279297…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 05:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2cfe350af2d123f3f3c48f573e54971d SHA-1: eb09b523fecbfcbdcd05a14c672438eb004e6b1c SHA-256: f5f8d33d7a2792978c21718f3dd2fda6d4e518990622ccdd48d80f9bc2ba9516
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/naragenufawavojawedur.pdf In PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/samax.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/0s9ti2mpmkm3rjsaecrnog5hhd/wuzapumawujujo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073b56ee774c---79871278815.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c34bded250---98713621263.pdfIn PDF document text
    • http://modern-pro.ru/files/file/rojaxetamuxixigewetezas.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///kifotidu.pdfIn PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/maxomapulerutoxokana.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/35835132268.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/acbfdd74e397827e30241ec2856b0d4b/libopokenoruxijugez.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/dexer.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d4d973b0---mujebunewu.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/dowaben.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c746c1bb63---76729356831.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16112febe884c6---51568876683.pdfIn PDF document text
    • https://rcot.org/userfiles/file/sudigorili.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/bekodonurejabumuta.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c6d48a91f23234d94cc010230309bfbe/rozonodudalupe.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/57561046184.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084626e63580---15979560991.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/timamunaduvokojixure.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/10137687080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=manual+handling+injuries+statistics+2017+ukPDF 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_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 17276 bytes
SHA-256: dcccc1c4d800fc5dbd950cd67fe62d69c1ec679f90d9d40e7ce41df584c78af0
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B6 11188 bytes
SHA-256: 2ea4a164f8ede4f3d8a120946df7ef74c19c9381b28106e0226693fb5696fc8f

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