Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9107edde9ca180e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 05:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06bdca70f3924b3e406b7ba9fff06f4f SHA-1: 765375e5246260f781275af0209e803654c82611 SHA-256: a9107edde9ca180eb2c9ea8f2f19f2f9e7648b51dd9d124d325f2436b93fceab
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a link farm and the nature of the detected malware indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huspanda.com/data/ckfinder/files/lifobimax.pdf In PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/90788043611.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091104251473499.pdfIn PDF document text
    • http://sergeybazarov.ru/file/tewokejerepelenoji.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83470256278.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/47853633127.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134363300f13---varufasikelajamobelutina.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/xedes.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/nekawi.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146fac71d8a9---kafegozirakujele.pdfIn PDF document text
    • http://adice-area.com/pictures/files/15422029354.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/msk0rui0h9som5okl3ah743617/25672960728.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/tonixejugan.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613234f623ab3---59766811398.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/rawidusutiwofufuk.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/tefekuku.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/86592780792.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc9854a2a---1142784307.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/63601425043.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/lagumilupopezaz.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/towegukota.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/50526599422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=4x+game+booster+pro+apkPDF 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_off0000d007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD007 21468 bytes
SHA-256: a617f1f328b385273f97063c511971a4f4a3b03e86823c1118b42840fefa730f
font_01_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 10668 bytes
SHA-256: bd4986b3350d5fabe415b87cd08c8b2aaac78e283d816a0f380686e859528bd3
font_02_sfnt_off0001206f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1