Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3fa14074bff828…

MALICIOUS

PDF

88.9 KB Created: 2021-06-26 05:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a56d80aaddc931eb4af22f0ba48c6361 SHA-1: 933f1dd142ff9cdd547b07b72cd1adb949120199 SHA-256: cf3fa14074bff828a3ec3008c0886a283632d20cd578fe078fae07c69903667e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://coretry.ru/uplcv?utm_term=300+successful+business+letters+for+all+occasions+pdf PDF link annotation
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/62fbb85e69288d9d3d7665d3ffd4118f/gasafuvuwoviz.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/28931571990.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c8b42ee3---dapekik.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f32da508ea6700e1159dee1186ba98bf/dulixed.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/15434193823.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/77822829309.pdfIn PDF document text
    • https://angkagenap.com/contents//files/xosalerapadodegaxijiwar.pdfIn PDF document text
    • https://parfumzone.ro/files/file/xemuxolifijifodasul.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92fc667cd---wasegodugaxopijiziw.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210625_360D9140E3F6E1F4.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077001ed3068---digodesuxemagumopogi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160aea35309d71---8896997665.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdef4e3d5c6---kojijedezotajagipejax.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/4c8dnol59l14qo0gqua7u5nps4/pofabupilonudotiweta.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/7032324716.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/setifesiwozidatoxazujitek.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160afe46ac7a38---dupexosenetewevufakofin.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079e149729db---duxatinepovabodozuvozasut.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf6dc17745---86310468054.pdfIn PDF document text
    • https://carlojans.com/cms/file/gidexetefamo.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/xipifaned.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/jivotemavus.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/79627568174.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/cef23d3cd70bb0dae8579cb2dc033ab4/judagedidomovoliduw.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7770ef782---24069239701.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lucbnc71gm95brib8vh7shdhv3/gunedoxin.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_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 16840 bytes
SHA-256: 0e2fbb176415c266bacab72a1efb8ed0c362118e19167e8eafc18c8c18e1af6d
font_01_sfnt_off00012462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12462 11048 bytes
SHA-256: fdc141fbf78775e2e690817a72a074019d73300a2f0f7665638aa7c6ffd3980d
font_02_sfnt_off00013dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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