Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa08717d5d1b8ad…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 08:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 99b39475c77a608f6a6e77542eb66c1a SHA-1: 4e082626280a73f5441c335980306f29ff4946e3 SHA-256: 9fa08717d5d1b8ad10e1428f1ad90e8692a32750bdfe2ff238a3a749e2a5f591
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories or disposable hosting, indicating an attempt to lure users to malicious sites. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://batikatravels.com/userfiles/file/81768355328.pdf In PDF document text
    • http://barbusci.it/maisUserFile/file/wosikufotujunuj.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db661b2d57---9509147111.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/64901205281.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/17166315540.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4eb23d77375bb2e277c1f4b40da10349/loxiwodovosetoj.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/zugapejonowutukejalagoga.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/38348575118.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/fixeleva.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/garujimofawolosijeles.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/7602976082.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/3194203797.pdfIn PDF document text
    • https://dintek.eu/uploads/file/97643398654.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/xiwabil.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/69301183862.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/52533076378.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403dba559e7---witufuwubibugolonikin.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/78158581591.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/dijazo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613992f7002b1---buzibeg.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/patevigubatozim.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/joresowovomevajigosoro.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/gazejud.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/tabugenonamedag.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/nifukozutog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=viber+free+download+for+windows+7+64+bitPDF 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_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 16628 bytes
SHA-256: 3d6cb3a01b57d84688c91fe60cfd816b3ba3f2aeef96fa7414ff9b2e3f5ed05d
font_01_sfnt_off000105f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 10836 bytes
SHA-256: 5666314f6fd4616916e3628836e71e91a58c09788d790cc95cb79fe05a53e4be