Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c17158a9501a081…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 21:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 20fb4071fb8e0c10be00f6d193cd5e71 SHA-1: e5d2b09be1d861ff67ea7a6ccedc71c997634371 SHA-256: 5c17158a9501a08158868a076b5020e4d2486dababc837e25a41cfab958612da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', and ML classification strongly flagged it as malicious. The presence of these links suggests an attempt to lure users into phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=blank+navy+brag+sheet+pdf PDF link annotation
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070c896d4c8f---45656055895.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/856c9f03b73a96b2defc44d90de1c509/15323436926.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a11573dcf85c9f69e2500f655d22098/25590705865.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcb3402d9a---15621034038.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/lafokubafe.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbstk9mujsog001lvac9bd0tet/japivoxivanej.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c110490f627---nijobasewigudegomoruxut.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ao3s58nvvko63nf7k73t3vf96p/foriruwanowakedirabufer.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c453d3d8cc---xosugetafinimoriruzajuw.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/50808151243.pdfIn PDF document text
    • http://envigest.cz/upload/file/bobosurapegaxolufa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc34d02fba---rigazib.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/sizipobapofakogete.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/guxobosesunigukujosubo.pdfIn PDF document text
    • https://penal-garazh.ru/files/didoj.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/pojeposufeguv.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1fced29a79d96e9024b702a37309c984/riwemosodo.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/69685429835.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081259c565d4---paxefedugub.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/vimumoresidiropunomof.pdfIn PDF document text
    • http://emeat.ru/var/files/65780037095.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/gigojojubid.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/kevepofixolikoduxajerewo.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/1f25a85419afb53e6ead93fba9bc70d3/pitisonuxeviti.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_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 18092 bytes
SHA-256: 3850ba6509a35df2199bd01dc6cfc73565a50eca5a30a41773324727a1155e2d
font_01_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 11028 bytes
SHA-256: 605793258ee22edf1ef14c82c39765cdce1e7ddc6d820baedfd2b73bf8fab832
font_02_sfnt_off00012a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1