Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afd9535887adb17…

MALICIOUS

PDF

72.3 KB Created: 2021-10-09 13:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2032836e4a1cc543ad94b79d2d972548 SHA-1: 6ff75e0e09156b3bbcdba174d9f51c59431cfe7c SHA-256: 7afd9535887adb174daad5d03928057867eeaa9e9fbc60898a20e1ed74066b9b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs that point to compromised websites and link farms, suggesting a phishing or malware distribution campaign. The presence of these links and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=to+give+encouragement PDF link annotation
    • https://phuketwebstudio.com/ckfinder/userfiles/files/rixopomimimetamazava.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/bimamubapilup.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614536531a28f---gifozegav.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/586783ccf52d07788147cce0060653a2/pewuw.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94619207a---jizulituzilepav.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/nujezaxikexuz.pdfIn PDF document text
    • http://annabarons.com/files/files/41942177978.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/jutuwobodovufipanawana.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/12150715704.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b90e28f8ad---damege.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140261591d9e---70010520216.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20211005083726.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/favenupegiv.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/53331703227.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/40190884662.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/99119832471.pdfIn PDF document text
    • http://telecycling.org/files/file/togozabajuzuzuredo.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/11860592374.pdfIn PDF document text
    • https://ptogel1.com/contents/files/77048798063.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/nojoxowejegifan.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/49165693551.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/bigimupujus.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5d49863d04124ab601f6ad213a65e2b5/levagakilolipowidisi.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/rosuxabo.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/g9n2pqnms6puh44k8chamk46as/3525586958.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_off0000bb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4C 10488 bytes
SHA-256: 99c58898d106e6d9b4f02dee619188c09571da5a1308309fd21c1ca3ccb84a71
font_01_sfnt_off0000d333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD333 15968 bytes
SHA-256: 841c478534db9f50896152461d8897c13ed9310e60b2bdcf2700aaa343e20b4a
font_02_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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