Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc45ebde33fbb16…

MALICIOUS

PDF

94.2 KB Created: 2021-07-25 10:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 03d5ff1750514d961775c18bfbd50121 SHA-1: 69a9c431fb17f592e69c0073111aa71158d64153 SHA-256: 0dc45ebde33fbb16149ace98e9cf1a42920106fe84b2e5594713c4e9daa85f9f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. 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 0.9916

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://cs-golfclub.com/ckupload/files/jebiru.pdf In PDF document text
    • https://loyallcanada.ca/editor_files/file/29344925838.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/nebeb.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b37d135fc7---nugovarunopivowix.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ttsvpc706dajms44d85c603d27/27685198773.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e3345c10f---35222331824.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/fifidizadepoxubawav.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160849980213be---weloz.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/nolufen.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/16928887037.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/94589984298.pdfIn PDF document text
    • https://makenie.com/upload/files/37199424462.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1b562d89---soxiwutinapafikutebidar.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/69544308316.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/zurilokusaguvudifulikubek.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e40471a5052c1431a85be334176e863e/tazulivegoduwekedasujeleb.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/67188691657.pdfIn PDF document text
    • http://bakoca.hu/files/file/80996737480.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c96e4cabd60e01a3b956b11356d2cfaa/resixu.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/260326329653.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb465b3add---13373383091.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/57625723585.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ed2b5f371---pawug.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/a250d2a2233884840738d96fbe35cf69/tujimixomaxif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=easeus+data+recovery+wizard+trial+free+downloadPDF 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_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B7 10880 bytes
SHA-256: d20bd4f3acafc2e08852b7511dc38be0ced74a9727df550fc4a34965beb65ff2
font_02_sfnt_off00012e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0B 2188 bytes
SHA-256: 25b3e1d1a9570369e8c647358a1065e64cdbb84af88251dfbbf10532d654b129
font_03_sfnt_off000137f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F7 18472 bytes
SHA-256: 2efa5796521da971326ef18265b51d7daf120f1fc94bf628cbd7229d0355c5ae

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