Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d21950bfe129c1…

MALICIOUS

PDF

103.1 KB Created: 2021-08-17 00:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4a5b9df07b1a32be92ee252a77cda670 SHA-1: 8321545cf2a661e2e5d51aa95c8a99515d16ee8f SHA-256: 68d21950bfe129c1fcceadf5476edc138dd84a5e83eadc312afe98fe23d1d32f
164 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to compromised CMS uploads and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The presence of a visual download button lure further supports the phishing pretext, aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=miraculous+ladybug+season+4+episode+list+in+order PDF link annotation
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103276c8576c---tumefowabonuzi.pdfIn PDF document text
    • https://cncunse.com/d/files/60414005784.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/78521119695.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160717eac35586---sumov.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1107a7a97f---tutuna.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ru7cgfh1947a4116k8crkk15tq/fitidinuravuvefi.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/wineruzi.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210621231446_zyhn66.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/bejabunipomarire.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5kt1pn4oeagipa46nsm9hi8555/70601131275.pdfIn PDF document text
    • http://nktrading.qa/file/files/13263406786.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0d01f83be67e0bb9a6b3033812ba90de/fekifivivodamazulegaba.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0122c199cf---6181960986.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/xaminanoxurakikovox.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d2ce87290---fumoxajigide.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/25370421079.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7c36f377589b187aa0dcfc46d7d73d51/2881961605.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/dd34f919157b326bacb032bc7e8b076c/71993914242.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/54898970474.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2379a65063225b2b6d6c164f6ae8724c/10065606978.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087827d093a9---gapimomezuxorumog.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/89361193888.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/gakigomozabe.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
stream_003_off00010768.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10768 21204 bytes
SHA-256: 02e44c3ca0e2a05df171322e7e2402eca76183cbecb6c30b3330222582030d2f
font_01_sfnt_off00012b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 18656 bytes
SHA-256: 3d19eb896859226cc6b1ccaf83274e6c9df8a71f7e70b45709244d7a39250f4a
font_02_sfnt_off00015c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17435 11116 bytes
SHA-256: 763d71b016cef6cc19f6898f92200664a3a7d3059e7a6e099be461ad31c29637

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