Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a8ed22b993e04c…

MALICIOUS

PDF

85.8 KB Created: 2021-07-26 14:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f6936b06617cf1121f4a0d4aef6149b9 SHA-1: 41f410c118375ef278d38a6a346870a64dc02847 SHA-256: b9a8ed22b993e04c83afcb4b6f4c73a49fb175f122b6e48bf7ff89dd5a41fbe3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nabijdefossa.nl/upload/files/2829728509.pdf In PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/e73de419b10b6bc4b0d01ab1190f11ce/29120324914.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609484c26f6bc---29743997109.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b47139176---jinakepajunuranib.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/fesiwutuxewokuvokaxaxibo.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/37023206817.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/df47302f2cd021337aeebf06960f8501/95536431697.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d5fa0abe5---mejip.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/nimasof.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608076f229e19---gafugenetul.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/12818361225.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f792793d1e---77955955873.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/fitefepikodigudugo.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/40958476368.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092a7b103491---39879163381.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/e60f8e6e07961dc33eeb87d01784ece1/56199799069.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d57bca354---77092068010.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b9c3587c7---milebugikutux.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/31711872128.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/29000176676.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/52a9ea7fcf999eba113758290a012eac/tojumes.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/rafajorerojoferofukaze.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/5hn2c86jmcn7cgmb8edftes4q3/21414036159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=is+toshiba+tv+a+smart+tvPDF 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_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 17344 bytes
SHA-256: e2ffcdfc79b80642e73cd55b890c620e9687dcb7e339ececd5346e91f285b741
font_01_sfnt_off00011a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A52 10248 bytes
SHA-256: c7578ca4761a46b04ae2af61f49839dfe7c42f2c32c5d758b828882c034372f4
font_02_sfnt_off00013167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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