Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7eaf5fad39e02ef…

MALICIOUS

PDF

101.1 KB Created: 2021-07-22 21:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 498c02480b76d250d2f7556448c2052b SHA-1: fef537217fe4c9bf19c71721b7fdca074a321ea8 SHA-256: a7eaf5fad39e02ef4fcdbf47f2ead4c4988443f67f3be3a5cb02371ebc9493d7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, offering no direct clues to the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://daiichihr.com/uploads/news_file/63695512014.pdf In PDF document text
    • https://daaeportrett.no/upload/file/9068840583.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/2039850728.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a3b9bbd5b---rafamigoza.pdfIn PDF document text
    • https://aedwea.com/upload/foto/pofowititufowub.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/31577660435.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/vtmss25pnqdseiq1rfsgvhvcmo/27341385785.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/63909618713.pdfIn PDF document text
    • http://synowka.pl/galeria/file/54039271606.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a70e533eed7---34111163549.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7432af360ac02873aee1cac4ada95264/sumigetulo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b65a46a8614---94912435848.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/jinigikexufenoz.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/17386654825.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/49181301161.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/94347883000.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d75801ace37---19993761256.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/t1411v4nblpkourqf5fbpuvik5/50581082928.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac60c33e401---nowov.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2471e972cf03e11d446ae1d55968794f/7818183872.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075efb5092ea---69217482661.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/32180042619.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/rutelilan.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/g02i3r8d42074vuke0i179us3n/44518949957.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/marizubepetata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=list+of+all+html+elementsPDF 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_off00012c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 16224 bytes
SHA-256: 61111ac5a309a3675c10b6647245979b1334322163b2a6c0558bbd746d81e46f
font_01_sfnt_off000156ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156AC 10336 bytes
SHA-256: df9de0a0aa81e9f5cb84a6665cc0c2b9d5055873b59f1b72b70a07f8fdf4e8cb
font_02_sfnt_off00016dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1