Malicious PDF — malware analysis report

Static analysis result for SHA-256 d972aa8d11d38fd4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-23 11:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf3949e417fb421d5ff4027b8e2ab126 SHA-1: 59585ec9c5ea2cceee2d8ca573c4efa4a79ae6e3 SHA-256: d972aa8d11d38fd4e8dc4aeae992232b38aa854c73482b92adfff44bdc306dfa
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd7556f4f6---87995975901.pdf In PDF document text
    • http://instant-image.net/UserFiles/Site/File/notimo.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/79489259046.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/10242231077.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/16476916502.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4ej14u0oovsol29ctr1fmka0mi/wejeb.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/zobosukowevawofovewek.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30005819170bfd3c34e4257eb21d2333/71636489455.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/waxudi.pdfIn PDF document text
    • http://parateam.cz/file/todososupizotumi.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/xeguno.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/jezotesorabefimakokojova.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/c61fbb9b8ba3976c17fd2988e5aa9c7f/1869533326.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/wupowupetuvol.pdfIn PDF document text
    • http://airsoft1.ro/files/file/vetolinodalez.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/giwoduvozamoxigawaxo.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/xusolufibupidaxuxu.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/zixopuzuvifutuvug.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/jukivasiliwuxe.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/felitipezu.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/lowiro.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/55610189150.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/dagususigokelazofij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=use+phone+as+microphone+to+bluetooth+speakerPDF 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_off0000ba13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22A 10976 bytes
SHA-256: 7cbfb7f8fb41f463ef4a212581e35cae61a182a2b4f50a8be426f7b1fcd69696
font_02_sfnt_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 17128 bytes
SHA-256: 9a1f0c203b3bf3c24ba7fcccd71d33e2dffcdef29c28eceef4f02b9d4f9e8f3e