Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44499ef0533ee2c…

MALICIOUS

PDF

69.7 KB Created: 2021-09-22 20:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c44c47042357422f7e885c304f9f53ec SHA-1: e9543af9491ac1b5009e5aea2c1854287a6aa520 SHA-256: d44499ef0533ee2cc32c59e4d1cc3761d3ae043e0f4ce7cc314bff9d9a58a063
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=cut+the+rope+free+apk PDF link annotation
    • http://re-media.ru/foto/ck/files/28953210793.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/fojeru.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/sarovudemupof.pdfIn PDF document text
    • https://red-adlay.com/upload/files/16075001305.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/74583578419.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614649c51e809---42368151627.pdfIn PDF document text
    • http://identik.hu/editor_up/60554817896.pdfIn PDF document text
    • http://bwc.lt/i/88895746710.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/nenepokotejatenor.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/54137227334.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/8473501135.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/senupajidagituju.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/91153152334.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210906044650.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132b62c97995---bapogowikoge.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/74893571588.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a2d97dd9---sanixoxare.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/nesoferuzunoxuveg.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/42954724278.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/vopotuduvabixibosozulajaf.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146f0b64c6bf---58710248943.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd34f833cc---silogenizim.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/pibakosewu.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/22664481232.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31F 15244 bytes
SHA-256: 2c328d949b6fb099e7b146796ff6bed2ef5ff2c7b67432186e89593bc34ced92
font_01_sfnt_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 10268 bytes
SHA-256: c6be51f49af8d021f8649eb4baf753b4d356eca564e679b8b6eab9548cc8be33

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