Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a218aaa267e46a…

MALICIOUS

PDF

83.5 KB Created: 2021-10-05 17:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5282e4930dd285309488c4d279e3dc71 SHA-1: 34ca7646102b57fcc2a9cb6e8b33928ac36611b3 SHA-256: b8a218aaa267e46a022466bbed4bb94370a80507553284c9e64d59fcbcdc1e43
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the overall structure and URL analysis strongly suggest a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://maslatalaia.com/userfiles/file/92317725420.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/90be620f7d29a907e50f6613d01d564c/zomovetujajevavuperedusu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161524a9d5b504---84184928359.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/95030978004.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/luluxokuzebuzevug.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/wutipogeg.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/41971624396.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///84946799682.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/zajuf.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/venanen.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/fisivenazibebamusunomowe.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/22d95aae6791f00d0f5bf1d0e5b2999c/fotikorafagozevedaparol.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///53050473044.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/gusutuxurebugawow.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d51a7143ce---guwokuwig.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fee43ea4dd---towilajupasifiru.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/vuzobepinanetitoxalab.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/41200909763.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109270057251013.pdfIn PDF document text
    • https://heureka-cz.eu/files/84082601307.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/52159296872.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/guwebe.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/tixupunurisitap.pdfIn PDF document text
    • https://peterdegendt.be/file/13046147780.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe8475eeb8---4354773327.pdfIn PDF document text
    • https://morabia.fi/images/file/94853865994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=worlds+easiest+game+everPDF 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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 10544 bytes
SHA-256: a06e6b40ba40248368f0b7494e40e068c868f5a6592c5946498066613b380196
font_02_sfnt_off000111ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 18212 bytes
SHA-256: 00b4ccac3c8b91d91b26fa0bc26b7f85c6aa0b44add65914b2904ee2b5cb502a