Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2f798929ebeec3…

MALICIOUS

PDF

88.9 KB Created: 2021-08-02 15:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e9990f3fa65d39241dc8946260dfd71 SHA-1: 70ef99ba1785aebb02eee422b8fa5bf70550f3aa SHA-256: 8f2f798929ebeec3ea282d3628e5e4766c3d05aefbe7d60ab65a141886ae0d8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/rqtieie7mq9s14mqtega7pkpup/80531560077.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160884e896a2a6---bimenomimepuroferatu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0cba2e50f---15849046521.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/21171565537.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/biredujugi.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/defot.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/12853113752.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/16632593188.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/pn0011ur4ao16iodppckt4tkbl/nozedufatafeli.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bd377decae6796e7e2b98bb441bdf052/jajoroze.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/zenidusogoraxajikuzuf.pdfIn PDF document text
    • http://runo34.ru/attachments/file/16303420362.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/rosonalivovavenokexomu.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/jumisizovozusojevizal.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/733e2a95bb05c5e4bb7270847706ee0c/81838621670.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/zugetigizo.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/sefar.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/gewolexok.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/lisevamonuwanaleboxona.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/lghaj7kcdfnk9jm8ncnu354b72/28378845949.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077cea2ce6f4---kotexuxuvokalet.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/60e12f75bf92b.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b553bc01---povidofibusafapepawefovuk.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/356d0fe416bedae5d2b566d9130b51bd/72217425251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=blade+dancer+lineage+of+light+endingPDF link annotation
    • 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_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 17332 bytes
SHA-256: 85ec06c18772b795d6418d339437350e12abe51823fbc38ad446c86cd8cac2a5
font_01_sfnt_off000118f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 10640 bytes
SHA-256: eba23946d6d44208e6b4a7cf7876e56ca87ac968a57504fd51ad4fbaf0ea26af
font_02_sfnt_off000130f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 3132 bytes
SHA-256: 0143ae9ff866e41fd30a00cec2fcf1a9496cf009417b8c3cfbe24ad5f14dde1a
font_03_sfnt_off00013dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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