Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddee372621aa8d1a…

MALICIOUS

PDF

101.9 KB Created: 2021-07-31 17:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6eef11c7e53d2dd05e6701bad9d7ad3 SHA-1: 95cab546222d5729a9e8d1df9a4c8af068e73adb SHA-256: ddee372621aa8d1a75ea416ba273e71dff9e297875930c5516689fd5a620bc45
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific intent beyond URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=goal.com+uk+transfer+news PDF link annotation
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5ssnq3d44bar9qts3etqqafi1v/benurubomuxokebefolaxipa.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd12e2df0f1---botonifigenodemugerul.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tadomizorokewibawibubon.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef9c7c2971---mulujegawumemakixel.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abac3761b39---jovabarosel.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/83159807642.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4r5rq46l8sqcid12onbfhi8n94/sunifetavi.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/12107412698.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/58277984225.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608298794bea1---88437468263.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b293a9535b6---juwijatoxonegape.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/gpafgekkefvkeucrg30rqq35pv/ladakisanu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0de1d03dd---muwemelofunabegifofozupag.pdfIn PDF document text
    • http://sdes.in/uploads/vovegozoke.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/8495ae7548fd9edb92ec874032744296/saxilerubowevoxej.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/15929937806.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608942d4b1539---xomipojugenemikawazaf.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210710_1B8C510A475BD7BF.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9d77cd3fc04d2aae7ce9e59923d5e518/duxobenagiremenixuf.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609689366ae4e---banowu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/57460226562.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/53255776057.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d287dc01e---rerivenetotakix.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/ponifoxaj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B03 17084 bytes
SHA-256: 63533abc0ca04b7848fc45a4b1284b8a2cd39bf6872d49bca1f60df2651d7a5e
font_01_sfnt_off0001241e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C30 20408 bytes
SHA-256: 64a664be78fafb8a936b6fcf1ec1d9dc005e6a106a97dbc9235742f6aaaaf6bc
font_03_sfnt_off0001705d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1705D 10788 bytes
SHA-256: 4f3532dfddcf77fc5dcaab7fa17ca8680144c4af55693bcac8b76b479c647c33

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