Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b0760e766b1845…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 03:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 089145221d770fc8093e930108a236a7 SHA-1: 8b6efd947af9e2887a5213ad9916a013c15ff052 SHA-256: 22b0760e766b1845af2b75c95243ac898f2a0628443ec57aff2eeeac863eb375
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farm patterns strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.iciparis.ru/ckfinder/userfiles/files/zenovawo.pdf In PDF document text
    • http://sys-svinding.dk/userfiles/file/52297508539.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/mabamozemavuvodewutu.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/jelowomuvone.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/vumanututukinumavod.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/93211266174.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/viqm903alg4g6p5fgvg3mlg21c/fepado.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e7673a05c49b9379722f6a8fde6a3ede/81289766702.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bf62939da59---kizojopukuzilezipejijo.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/bukumodafupufukidovigip.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/maxedanejubuj.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/87916298721.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/nigifox.pdfIn PDF document text
    • https://synersys.fr/contenu/file/61138871632.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210627131521.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/59313713252.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/buxagaxetude.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48957982583.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/27809676751.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/01073c5b1526d5149a3fd3b53fa29c0c/87111033896.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/jifaziseruma.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/34224550670.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/80164605310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=elements+of+art+worksheets+activitiesPDF 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_off0000d4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C6 10828 bytes
SHA-256: 9426f5db86e41fe7cd50f0b24a6879e88499e8c4cce54fb6b1635f500ecfc45b
font_01_sfnt_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 16092 bytes
SHA-256: 87692f0fba1bcfd3e3e07bc4711d3f51cb3bf29616c934b067daa014e2825673
font_02_sfnt_off000116e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1