Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95ca8388c3bb582…

MALICIOUS

PDF

135.9 KB Created: 2021-07-02 12:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43e15cef5c47440bd503b686f03afac0 SHA-1: baf7e7f6b7331b7c9a0a6d8296387d21c9df736c SHA-256: b95ca8388c3bb582a2caccb5c03dfdaef98c46bda93e0105b33a8c702c8609d5
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely to distribute further malware or facilitate phishing attacks. The presence of external URIs and links to compromised CMS uploads suggests an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chcial.ru/uplcv?utm_term=a+tale+of+two+cities+book+3+chapter+1+questions+and+answers PDF link annotation
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/ma4qbk0nl8eoph9gtscari6kmv/datuxivaloxapis.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b498d1410fb---wegasilaxejajugagajo.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4b4cb1b0---muwamajasudekepefuwo.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/tazaguzuneragonajizip.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/6f7a2ccf84a7773d4cf969ef17ab6fba/67050285028.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/tejowivotadivalejogula.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/pewujolemefawidapipikuk.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16075e88837567---46385650342.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/lolawekituledukuwetez.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/88c02b23c687fdba69566a76a84e2317/rifawixavotuja.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a531a37bfe---fisebabegomobonemogava.pdfIn PDF document text
    • http://rc-modeller.se/images/file///dogilejumezava.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b288b1bc8---zijabaxozujigifuza.pdfPDF link annotation
    • http://hockeydh.com/files/ups/files/2916914759.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080b85ad3903---nuwaduro.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/jelusokogukopi.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/7316012902.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/19128880404.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d44a47b3a---14862003453.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/semese.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/mekiwovuxe.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/jevipom.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c219d10a82f---72179122840.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_off0001b059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B059 11488 bytes
SHA-256: cd60a0ac71064ed1e17b069ab4d888722fdbae8a6b6dc71c3911820f3a9fa3b3
font_01_sfnt_off0001cb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB2D 17988 bytes
SHA-256: 42803b3635406b7dd01bf4c3bc46264bc2cc5a3f5ad163dbc85b05509ce28312
font_02_sfnt_off0001f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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