Malicious PDF — malware analysis report

Static analysis result for SHA-256 0debc340baa365d4…

MALICIOUS

PDF

141.7 KB Created: 2021-09-01 23:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f707605741865860a5b1f53be0d4ac69 SHA-1: 7d3410b1f715a82e7060369440020ad284cf3989 SHA-256: 0debc340baa365d48ceb756fdf7869110401230c16010e3b0ffc5493e41bdd68
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://debden.org/userfiles/file/89656232203.pdf In PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/b8c15378750515768df415b85f80a370/1941327818.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/jiwoluj.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104f20ac9f14---luvoz.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/zibedotapu.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bosite.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b985de618---18444263646.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/15568807225.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/85809187179.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092168561706---87883655216.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/238396f898382b1170cb52f1fc43fd11/25798227940.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/64f23e7d3281377864f1a6ad1feec66e/27055044623.pdfIn PDF document text
    • https://strechybenesov.cz/content/69663710191.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/muvozosibedo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b52b8761e3f---53794284679.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/49003289431.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/44853055563.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/vedidiwikedajiwezajudi.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac03688a4d6---83534810109.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/b0c7erk305h6k7k2c7siuj98bp/41894333318.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/3lmtf8t3f312p1v26vjqqool21/87169694620.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/zedapinajotararogevipiket.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/1892593574.pdfIn PDF document text
    • http://dalaichau.com/files/3816409297.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be22d438720---50848588421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+norton+anthology+of+world+literature+3rd+edition+volume+def+pdfPDF 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_off0001bdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDEF 11280 bytes
SHA-256: 615454a7d34322656466be77b1a27459c7fa32128fcd6ba205c909b766241f03
font_01_sfnt_off0001d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D821 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F033 20460 bytes
SHA-256: a9174adffc4501921107c14676605dbed4acb7e2ec3f6153ca664cef0abe83ce