Malicious PDF — malware analysis report

Static analysis result for SHA-256 c561fa6b4361961c…

MALICIOUS

PDF

86.6 KB Created: 2021-08-17 11:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a201b5e5db0bbdd26b42e54a7bc0fd34 SHA-1: 064eba01d93aee57b54505d32c2f8085b6a79269 SHA-256: c561fa6b4361961c58793f1f49d421aecbc259f2d08ccf12141dba0a83ca2ddb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://songod.vn/uploads/image/files/30070379280.pdf In PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e1d0e3af5cc89c99b1c37ab92e7e8dec/lakakofaboni.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/76175733961.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vusuf.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9c1728be337c395d99e34b39cf7d1cc/74389465699.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/21691340901.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/lowulo.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/xosobegegotapeluwij.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/44318027983.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/63714485308.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/kijozowosoligutiru.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/82037042303.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/rozes.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/bolimenivosasanigagujur.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/nejirij.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/11436326803.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/21341265935.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/knep8r3nmm0nl06rvags2rmo79/felunegatonorexi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3558e8ce9a---34578551878.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb0beb9e41---61172356225.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f45bc3995c---vawevefovanuxam.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0f12b4695b6d73984afb618ccadadec4/8202768927.pdfIn PDF document text
    • https://mattress-leader.com/media/vewelabid.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/3031438701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=drastic+ds+emulator+apk+full+paidPDF 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_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 17080 bytes
SHA-256: 1eafcfd46b76cc5312234a2a9f42748a71013499d91f38a9c692abf053d48d38
font_02_sfnt_off00011de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 10872 bytes
SHA-256: 81fcaa1f3fb30dbcaf75a1cc66f835986e929d1c9e17e5914653ef0d4dfd2652
font_03_sfnt_off0001370e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370E 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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