Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a878d43e7c03c9…

MALICIOUS

PDF

85.3 KB Created: 2021-09-14 09:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5d0e311f75f48ca07ddcd6113c3be36 SHA-1: 1a2fc56ec2efa214ab61028fc5e900a304450e12 SHA-256: 61a878d43e7c03c955925816a28f94395c91614cd7454de2160145bdb742eea9
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, with several hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point to a common tactic of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://napiarsaigh.com/images/velozesoxixuneli.pdf In PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/disivamomuvenif.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/makumuruxor.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/3841217808.pdfIn PDF document text
    • http://shamayachts.com/upload/file/kezumosozebonufabos.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/fowavadajib.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/risatedakavomik.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f481b3bdef---84811014626.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b77b6e24e4---96010799350.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/e89b24g8e837qltjt13qrqgi8p/tuzugetewazutegabogasorix.pdfIn PDF document text
    • http://islandpointfl.com/userimages/gobepawatubazulixavopi.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/50967834e50f2ad2e6d0e2d5b1133779/51512812544.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/85481560341.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/74234608751.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/miliwisikoxox.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/jeniwipopifawekiru.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/figenegovoz.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/47398120619.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/safosev.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/63521988555.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/21185081350.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/suvugimi.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/fifajonajozukolufebut.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/28060567040.pdfIn PDF document text
    • https://kuepancong.com/contents/files/gugefobunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+tricky+interview+questionsPDF 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_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 17344 bytes
SHA-256: b51185d5c45fe049d010dcbf0de0851bebd11a21762b65115e21cb62fc2bd651
font_01_sfnt_off000116e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFA 10740 bytes
SHA-256: 1e8271e9e31d5d165de17f5e48e1fa27f6a28fbba1bce5785face308b516e086

Open this report in the interactive analyzer, or submit your own file for analysis.