Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf82952a37ae09d7…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 14:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba394df10268e3c64fa95be5a7713774 SHA-1: b49d910a88ff979ae4fff4c148361e1c8ce915f3 SHA-256: cf82952a37ae09d749403b29c9ef8a9969806ca44d586449b39292837004f5d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/miqjlvkla69bjnkv2e0n8ir3ls/15924146064.pdf In PDF document text
    • http://bajcsidavidfoto.com/_user/file/fujitajawelulowej.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9e950a43552a0fff1968ec4636042f54/70299471707.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c2aad477d8---64403308650.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/46064977759.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/46406907680.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/tuzoxupilapi.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-22/20210622195756162697.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbc20ba25f---jujifilobukuvaxisonezonox.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/24652365058.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860eb2697af---savudir.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/pexoxinawokumupuruwezodu.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/30357393273.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e26b622e5831a88353d83d4eec742a54/sodabab.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3a521c8a568a63e314162a8d99ca32e8/10067251338.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/68986786664.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/55370662479.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/niwupa.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99e3f266e8---31600412067.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/kepoguravesatinalixodid.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/23927700668.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/43171898700.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/26594766442.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078be2d43ec5---63473573268.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/1o1tsaon360kn7upfqc32s1l92/gurefidevorepagukogafuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=definite+article+worksheets+in+spanishPDF 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_off0000cd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 18116 bytes
SHA-256: 129451800438d91cfd9cddc6086d3bc55258575a988bddfda767a32b11201eee
font_02_sfnt_off0001148d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148D 10756 bytes
SHA-256: c32d802f2546eec494f045db0f8edd73ae88750d70cbc7fecfd447e206e3dc4b