Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a1e77076d5c84e…

MALICIOUS

PDF

88.1 KB Created: 2021-07-06 22:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3d0bf5ff199dc24c5078a00d19e606e4 SHA-1: 29f18e3c8ab71a6a1f3fdf2e5db9f4de6f8e7cbc SHA-256: 33a1e77076d5c84e005ff5bd6485825d2bf6e9d50bde2460a0ffa818762d1a68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a malicious intent to trick users into downloading further malware or engaging in phishing activities. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=adobe+premiere+pro+cc+2019+lower+third+templates+free PDF link annotation
    • http://www.alexgis.com/siteuploads/editorimg/file/wisix.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e81e2db6f4a45bf620b56b2c64be1838/67238234540.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/67621170975.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5ecf43f0048c8b600b78ae5724f780fb/57155505710.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/21100043965.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e15376b6e6---91595401802.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6eed42eeb---titemetopisenejifejiweza.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fs7p5qgrlmvjbvnk2l7kabvjcb/xafop.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/deninadukawigaxo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/db97e187ee8105216a4d5b0a5dc7ed1c/jexojutaniwoxofuworusa.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/19747338207.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/9292629313.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bde7a2da16a---nodeduw.pdfIn PDF document text
    • http://apcmagon.com/userfiles/tulejixizidubexudomi.pdfIn PDF document text
    • https://coevent.ru/upload/files/80098579491.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/86255257285.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607465692b31e---xupiwupejapojodotuboton.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/finisiwedo.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608005fa8184f---24646984239.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d5485e3f252---waguzemileranewegevuke.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4e79faa16dfe76597f9e6effd850d495/41593448632.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/e9a2b394dcc723b45ee936993c991c8a/zufetug.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9d93d832eda48448e49f99c39cc85586/32379792225.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/figeviwawerivo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f863524ad5---lexokegaki.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072817a35a2c---22621663966.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/a99b0c75c11bf166a1958037ac6c2d5c/mopabawifeg.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_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 17160 bytes
SHA-256: 140e23cf1e1635237ac2b3086887d6ec55a45b15a5b3b0ccf82fc3bae981d7af
font_02_sfnt_off0001358e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358E 11448 bytes
SHA-256: 948dcfd1f1949a013aa14622010f305b7eb8d8686a320449de1a703f136566aa

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