Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5072f57cbe1990…

MALICIOUS

PDF

78.3 KB Created: 2021-10-08 17:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2e1e7dedb6f8664a082d7ccf5a3d2e14 SHA-1: 16fb4bbced5c42887fff8fc3ae5541fbce92150f SHA-256: 1f5072f57cbe1990018dc8cfd9f4116cbb040eae7ffacce512ef1a1fcb41f9f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm designed to redirect users to potentially compromised or malicious websites, such as 'inwebjor.ru' and 'narnivet.com'. The presence of embedded URLs and the nature of the heuristics suggest this PDF is used as a lure to deliver a secondary payload or conduct phishing.

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://inwebjor.ru/uplcv?utm_term=sony+computer+manuals PDF link annotation
    • http://narnivet.com/userfiles/files/bonazizoxabudatiwapilet.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/gasipolavena.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/40035782194.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/18315774306.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/belogovefosabozoxotu.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/lafidofalavumela.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/39114462876.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/38795778389.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/bezowel.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/pevozimewibebigiw.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109160630518548.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/jenadujomurotuboz.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/5365172276.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1630521281zozodilefezuleniso.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/260d8a2dcc6ef02db1f6659a4ee3859d/24396807513.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159b42d70d8e---27793072086.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/jedudaduju.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/lesatofokadedejer.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2da6d4600e86ddd9634abb322c963c63/24233014451.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109020555509364.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/welitigepaxiponazow.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/lixivakinavakufipo.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/73268247857.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/matuzevofik.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/kujujotakaxam.pdfIn PDF document text
    • 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_off0000ca41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 18024 bytes
SHA-256: 93f006bf51e5ab3d08b39c6bea41ac41bdb4896025cb032bc4de60046c83fb8a
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 10732 bytes
SHA-256: 51480624f42f321b8ef04515c3504d8b7a77bb8af7635c9247355b7ee2e03f87

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