Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc5c71206f80a9e…

MALICIOUS

PDF

90.3 KB Created: 2021-08-09 16:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6a43e9b2a3cce49abfbb8ae2aaca4581 SHA-1: 18e8ee4a9ab569690e5a159a02b11e69be66efc5 SHA-256: 8bc5c71206f80a9e082640eaf058c778164af9be3336fbeaa417eced0e050d03
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate the document hosts a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a visual download button lure reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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 http://jdhs77.com/clients/58520/File/xexuxujupusobojajanoninin.pdf In PDF document text
    • http://snsi.jp/image/news_file/valeveg.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9648361bd099d412bea9e476906f1f12/toxodigumemomugowawubam.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210610232127.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709c424adb7---kebebizetenurumos.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/zodupatekupawado.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/tufonudabaporozexasol.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6126dfd8e911d2bb9d2ff0d06a1a088e/nesukevolijujuxobebupili.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/ab8fde820517050658afcd56d3a85eb3.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/jakegaf.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/xowawijuxid.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/12680384315.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ok8btbjnvtjl1sktnsb9hqap1/vixuzogeva.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/tbebhda0pgm7f7hcp210kf4i66/fapudiwilo.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/63726880825.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/luxusemis.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/9c9803dd16be87ac13fab10337495fc6/60034412135.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/3eaaf76356b11790c4ab5de2e2f51805/86164629965.pdfIn PDF document text
    • http://ashioke.com/images/library/File/10687256901.pdfIn PDF document text
    • https://abeess.com/userfiles/file/duzegilak.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/3fjits9mtndahdv720m3lgunss/kusatafewanowovixalenirip.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16092c71536967---jamapibugipikebateb.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/54149703616.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/rikulizal.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/nu825egpivu272j6pi6668apqo/lomamuvim.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4d286a3dd---zaliwogesur.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/modimalunupoluzik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=loveyatri+full+movie+hindi+2018+bollywoodPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 17948 bytes
SHA-256: f48e097ecd7a5852ab2ed235afd9aad535ee1520fc5d72016238e500b992dd68
font_01_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 11416 bytes
SHA-256: 93a11e3bd66f2b65d9d1262381f0b8293e72ac876f53f63716fc7ff2f9644d81
font_02_sfnt_off000141ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1