Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3a2b49dc037e37…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 08:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 27cdcb4cc7416e554117f038bc457d5e SHA-1: 9beb74b8616ea3bfce6d1e9341a4cadc918390cd SHA-256: af3a2b49dc037e375308957986049c03a575e14c09f4aeba3e997327823cc6d6
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files, indicating a link farm designed to redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests this may be a tactic to bypass security scanners by requiring a password for an associated archive, which is not present in this sample. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://viadagio.be/userfiles/file/28848576100.pdf In PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/13456626482.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/tetelojedivevi.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/80980487614.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/26392178258.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/31874782982.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/zufadojatovor.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/zubado.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/tolunorur.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/kikili.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/10525025139.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/jepisadelakonebidakug.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/60921158312.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443b5f4e38e---zamemufudukoxisejakel.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcce067a86---37426160960.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/xixavifesebatubivikofana.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/2065909818614343978904f.pdfIn PDF document text
    • http://houselandia.ru/files/81170550300.pdfIn PDF document text
    • http://muszempilla.com/files/file/mozawevapewinapiwak.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2e18cdeaf95836ef215baf87df9216c2/seruxiledo.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/8f38bf4c449f322e3d8bd522f30ce348/virov.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210916183311.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/bizaxuvozukurarujover.pdfIn PDF document text
    • http://glttek.com/userfiles/file/58531594724.pdfIn PDF document text
    • https://jetaime-shop.com/files/vimanikilavevadujaxozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fifa+18+ppsspp+isoPDF 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_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 10108 bytes
SHA-256: 2aedc31c3de825c400ee3d92f3ee6c2428efcadea011ba3be6b2a69c5b3d5dcf
font_01_sfnt_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 17692 bytes
SHA-256: 64011b9675b8d7859233bfbb837b8d4a7c7217cb33d13f66ea109a414826daa0
font_02_sfnt_off000119bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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