Malicious PDF — malware analysis report

Static analysis result for SHA-256 16084c9c24845e52…

MALICIOUS

PDF

106.3 KB Created: 2021-07-02 07:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 330516d826d8dda922c53ccd20d46953 SHA-1: 0301f7aec323cdc45f14da21c7452f611d57312f SHA-256: 16084c9c24845e526d3f5dfe99f1e28ccc12e671e4f51cbb077a4c8189d6f6e5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that impersonates a document signing service, a common lure for phishing or malware delivery. It contains numerous links to external PDFs hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9308

Heuristics 7

  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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://kodcomputers.ro/2664/uploads/sevibejedupa.pdf In PDF document text
    • https://arendic.cl/files/ninosasilupobafa.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16098ce190ceba---kififutinu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0755771bca---fokovixazazepowipobebolid.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e2a2e051---tetulazebedumedanaxedibi.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/gidexijosipizazavopiniwe.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/tapafatajijesozuxez.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///8046270561.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef60c7595f---tafizumizakinozo.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff94ddeb81---fudafokajanarujewivuki.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/85395713696.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pjo039qnl2qoe5dmq8mqf35h85/kukudovupifiz.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/rebofobazesumaketujo.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/81deovu161u2bl4adtu0kbv7om/10247488947.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c443ed68cba---63019006297.pdfIn PDF document text
    • http://vhktn.at/images/content/files/muziv.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f72a6b47---1505534801.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e23f78262---91522486853.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be3e5ecca6---26631344196.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/54714990952.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/21042833841.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/58075249312.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/11287590958.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/xasuwijibarijuxenupimomek.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/86412804246.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7fd8f945827c3ca9516a10e130bd5495/wiribeposokab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pdfill+free+pdf+tools+reviewPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 10376 bytes
SHA-256: b36c74eacd35f244f8f4d2980d76920821440029a1c8554e3b8db7a4d17aee9c
font_01_sfnt_off0000f6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_02_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 24984 bytes
SHA-256: d3f3da514cc9a94f762464feb506bd213dd8ae04511402053d2219bec9dfb892
font_03_sfnt_off00015699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15699 17000 bytes
SHA-256: 0a538dffbf9a0a319d996e755e327451f71d4875e2adc4597bafa2a176a823ad
font_04_sfnt_off000182a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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