Malicious PDF — malware analysis report

Static analysis result for SHA-256 73076ed720bd1509…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 15:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 039b40c9e9bd8d98eb9b27945e4d13a8 SHA-1: 6b2362d66c465c3db002def31224fd1efb5e4a95 SHA-256: 73076ed720bd15099c024e642a73c5aece9f911bd100c9373ed6bb581077858a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and a link farm pointing to various domains, suggesting an attempt to lure users to external content. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly indicates malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content for analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=whyte+vs+povetkin+live+stream PDF link annotation
    • https://jbdclothiers.net/emailer/userfiles/file/jamililurupinanolefi.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/pajukanopuraga.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161314f607a78c---xofesa.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/gidepivadamaguladelix.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/kozibinugunagugo.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/zazim.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/zilajorimiragelolape.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/f4ip3da5hfhp4q2ha7umssdnp7/laruni.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/xaxefudulilakoj.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/72132593482.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/71405010358.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/82c5c818076b9a5304097e697ea53b7d/jubujefumanabesigekigo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134feef787a1---tujeragawosixedu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d49268592---xejifibomigokepimoji.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/ranivol.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/60838115764.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/50911343941.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/buzikobinujupuzu.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4da63a69---tuvuwowemijofevadudafe.pdfIn PDF document text
    • https://emmaushuis.org/pages/61413344004.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/25618097417.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/76478573728.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/vidimezo.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/garemuganawoli.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345d82d6d04---60601643298.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://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_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 10784 bytes
SHA-256: a9ea8b79f018e4f5edd35601fb448741cfed4f7ea61eb4bf6f18016d81a6da64
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 18012 bytes
SHA-256: 73ea7e380d36ae4463bdab72af9ec779f174e5fda6a15f6b18f009c5c3aad2bd

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