Malicious PDF — malware analysis report

Static analysis result for SHA-256 d832b5a9867af7ad…

MALICIOUS

PDF

87.3 KB Created: 2021-07-04 11:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f111157ac3cb9ab708e50a2c52a6ff66 SHA-1: 455237d07e6c4d40c7d64913eed53d41f7b0e71e SHA-256: d832b5a9867af7adc087250d4b4d1300fb7a8228eaed924b69988a477bf1c470
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains exploit code or phishing content. The heuristics reveal it functions as a link farm, with numerous URLs pointing to websites, some hosted on compromised WordPress installations. These links are likely intended to lead users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://wastran.ru/uplcv?utm_term=how+to+take+star+photos+with+phone PDF link annotation
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/70637b2678ded62dd2f0a2c34294c383/sixaginuji.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/sidezesitu.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/riwawilobimuro.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7c848c5b6b342a2c8306cd7cd18100fb/99688463246.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/kizuwuxaminodo.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a753c80b025---rojosurafavuragidufipof.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f928074934bdc3604d476cb2238bb28f/fubevipa.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/94007293943.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/eai989tqn5kgu4coqs1ccefmrj/39968754939.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/49080877343.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4268f030f---matawemego.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/5a9e05b167f3ed4cd768d3aea7fe58f8/salelikawetonivonoga.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bce24623135---wotolifafifoji.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe97fbb765---jufuki.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/vinozinow.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4d0fde6b358b75a643c4a6c526b1174e/rivazoke.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d294519a7f---bezoxamisu.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/xibikilevivejudojosi.pdfIn PDF document text
    • http://hasyo.net/files/file/wutexavosar.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073233c9de92---16398246946.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098fd69345d8---69447669617.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0ebcc0fc---mazeguzamik.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/45658078408.pdfIn 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_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 17108 bytes
SHA-256: 9e3918f7ae9a58f9694d4a2004ed79415ccbf3ca16d2c7db37157bca66a0b29d
font_01_sfnt_off00012704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1B 10472 bytes
SHA-256: 13111a15ea749a31cc5510104adc8b00f52ac21b217c5caf995b76d1ed7a76dd

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