Malicious PDF — malware analysis report

Static analysis result for SHA-256 6111f8fefc8a3b7b…

MALICIOUS

PDF

95.6 KB Created: 2021-08-07 18:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: c8e194fe8d76dfd92093650d323060fa SHA-1: a5223a216b335e8908b456981c6463e6f95d5d7d SHA-256: 6111f8fefc8a3b7b6596f8593134aaa2b5445f7ba6d96d01793991e4b7583b57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=la+santa+biblia+reina+valera+1960+pdf+descargar PDF link annotation
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f04ebcbfb---wagedogosulobunavuvem.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/puvowawukebelij.pdfIn PDF document text
    • http://93564497.com/userfiles/vojij.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/75465908819.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210807_7697069409B0681D.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/02c619b947fb62969043142e3b46a4b9/41752092157.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/63202221735.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7cdca66ba---5227854502.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/nixezezipagavajefija.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/5b85d7b59c8825452de5db10240b1bea/rumuzo.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf32f737009---76061707075.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/bd20fb05449c7dc9a3bf95754dbbc444/41585796556.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/qj854skfjk7gcnbnhqe75kucn1/42623447797.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/2235255405.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/20177805010.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c203a572e86---mugulewaxamitiza.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c5e84bb89---17544821987.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7112336cb---26855055444.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/9275dacff1b68b34492eda04a115f6dc/56917848489.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/92878018331.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/bevid.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/vebadoxanane.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dce8bd07fe8---32351668017.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/975a766f4dd0300e9ffabb3ecbf65e92/tetekidupavijuki.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 17624 bytes
SHA-256: 61d8f24804929c28c398b548b1a1496710d5e04cb3b86650ada7e15e432e8676
font_01_sfnt_off000124f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 16244 bytes
SHA-256: c6eabc0e786f34e9bd46a20732e32404c3a2056509a6b0610068810470d9e2d5
font_02_sfnt_off00013af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF7 11348 bytes
SHA-256: 49c4c8a0fe915a9d648664cd4e9fc6ac281dfa2e155defedf3eacb72038f4779
font_03_sfnt_off00015566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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