Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dfa634c516b4cb…

MALICIOUS

PDF

86.8 KB Created: 2021-07-27 15:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67f82cc993f8abf9bdc9635c334d341e SHA-1: f679cfe9e506a5e833aa3b42f6f8422c9f1d69ab SHA-256: 39dfa634c516b4cb5c4e7af18a4fb981b65a189198233956feccaea7328d98f2
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 WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is unreadable, but the heuristics and URL analysis suggest a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55ad0d67d---buviridirinaporat.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f87b5ef129b---70716788713.pdfIn PDF document text
    • http://rayanchem.com/d/files/xomuzezu.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/redukatunezawib.pdfIn PDF document text
    • https://bdata.vn/upload/files/66744776223.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/64f8e2fc5b7f9d2950e3facdf3c68012/majef.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/menujijarali.pdfIn PDF document text
    • https://armenia4d.com/contents//files/47849726365.pdfIn PDF document text
    • http://geoman.cz/data/file/11827023966.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a63b9888---69204422327.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210725162723057967.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/4c2a05db2011e0a264f53745ce21883a/bupag.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/rulitimafu.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/50177094005.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2bfe1baf17eb47ce3708a8ac7bba40c1/noroxawejevitomu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08aac139a---nenuravusinurokuvokiwuxo.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/takaluraguvijifejewumo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c633859fa5---refarejerefolizedugogeviw.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/be22c7ccf2d3ba17eb5fd6cf136f451c/17294491400.pdfIn PDF document text
    • https://coluer.ir/documents/file/54782106752.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/tasutidopenubolakago.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/92241925251.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc68be14f9---34995609597.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608624d46fc99---vugefaneg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=thailand+visa+on+arrival+application+form+for+indianPDF 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_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 10784 bytes
SHA-256: 76676402b93b45bf51d9d4b183910472f6121b6b479ff1af550b1b9249ec9837
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 17016 bytes
SHA-256: 4a232d5cc9c6fa6a69fd12aad28aff77a4b29ab77661a41dad3148d2c944c2b9

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