Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb90b8c1f8718d9…

MALICIOUS

PDF

434.5 KB Created: 2021-08-14 00:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 87eb9d22975693b666b40465ac255b94 SHA-1: bb7bf418f1516c86339ab1eba84de5808b5c5db9 SHA-256: 8cb90b8c1f8718d9d1afc2cb7b8ce3da6238c3efeec0010d6fc165c0a78a63e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8309

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=16+personalities+infj+advocate+premium+profile+pdf PDF link annotation
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/javivilovasomeresanisa.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/vepizinelutuzinuxu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ea57b5ba0---40321701610.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062112202314.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946786dc3fd---mesarumuziwijupo.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a59afdf2b46aa4f58ac9488a67fe89a1/bevenazigibuxutokumaxovu.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/lojopakafowalejepoxeraju.pdfIn PDF document text
    • https://webmenuplus.com/images/file/wolowowuwatuwimigupi.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/7e56cf576a850106fb6b701a58658b1a/7087277409.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2998f11da7a358f61fc03dc8fc2dc9a6/bonapoju.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/nikemokunivubegem.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/be51fe06e0495430bc66ce15b608f5a0/dadew.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/77959257678.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/q64m1mr66f4hi5e6agd3va4pom/97896587320.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/judinuwajaloxopop.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c044aced955---tureluxemigafenazumetifap.pdfIn PDF document text
    • http://millecolori.it/images/file/verezup.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/manesibenima.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a19aac3f110---79053825574.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/63298218529.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/ur28av9dij0aarfd6nk2gj9r4v/juvedulowo.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/vuwojefagusavirifo.pdfIn PDF document text
    • http://short-story.ru/upload/file/99498774197.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_off000655ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655FF 18460 bytes
SHA-256: 18fb5a4ae3b0f2ae4bb2c95011ac067270cb705a8c8999baa3f235bff26ededb
font_01_sfnt_off000685c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x685C0 11200 bytes
SHA-256: 21179494bf99b2a23754a1e888a7f495d90edbb62c8f5d8abf4aafb1c77b8ddd
font_02_sfnt_off00069ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1