Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe94ff814b1a473…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 23:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dec5d69298e5badd058cac8d72a00282 SHA-1: 67c91d6b65b3eff16eab54f46394fa639810753d SHA-256: dfe94ff814b1a473baf5290308acc46666400c760937e78679a1a725763aff2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to various domains, some of which appear to be compromised CMS uploads. The primary function seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crewmak.ru/uplcv?utm_term=language+and+culture+relationship+pdf PDF link annotation
    • http://serting.eu/userfiles/files/66219669830.pdfIn PDF document text
    • http://wawa757.com/uploads/files/talekoderisurekupu.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/75853689102.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/71025076666.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7c9e237cda86aa2832b61eadf541bcb9/10520024589.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/xedaxud.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/banav.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/56032952429.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/qgs1fvh17ni94oec1ekaevo232/xodadiwipuruze.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/27888892769.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/45540670119.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd5710c49---86542768192.pdfIn PDF document text
    • https://tmtteks.com/files/1037117340.pdfIn PDF document text
    • http://azizolace.cz/images/file/77012273645.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/tuvozuwasamotoduxezixutel.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/57274209509.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e73a9a46c---26299044610.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/noxed.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/292e04925ebe89b122572672d900a9ec/kanexizigowo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125300063e9b---34690072491.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/39376081319.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b3242d2fd41b4839bd3b80d597a7224a/83297744307.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/42091893979.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/foroto.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_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 17240 bytes
SHA-256: 0dd585ae105db9b7e6ff914042467f144b2d998e6dce51ebcc50f4f16f3ac957
font_02_sfnt_off0001338c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338C 10956 bytes
SHA-256: f1f5f8b3d8ecb0122d15b8029ccb50f1540a193cd8a34ea5930a9e00b3028122

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