Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efdafbb47420348…

MALICIOUS

PDF

80.4 KB Created: 2021-09-24 03:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 785b0e4679709f3549320003ac86efc7 SHA-1: 83e096693e96b07a1aebdaecc3807e61f0cceeed SHA-256: 9efdafbb4742034816fa40faf43c1a821c6ac0e25d9badd23eceeea4f9729ca7
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The primary purpose appears to be directing users to download further content, likely malicious payloads, via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://drafthe.ru/uplcv?utm_term=bloons+td+6+free+latest+version PDF link annotation
    • http://getampedmag.com/ckfinder/userfiles/files/lemovas.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/68546909302.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/34390388199.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/25107708749.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/fixiwas.pdfIn PDF document text
    • https://grandegroup.net/files/49582356012.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceb156bda8---tuximituwogage.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/96860558749.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/tegowo.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/simodomizuda.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/39107553699.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/53017952472.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/bogumegu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/161404e7836a85---19006069699.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/81140461045.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134155864d49---24664937048.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/63168101108.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/46269831454.pdfIn PDF document text
    • http://soc-in.com/data/media/files/80988091689.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/4039068188.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/rememumedunupobik.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_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 10636 bytes
SHA-256: 05ac0861ae5a4865a2880510f83b149a280f9753b57a2bc9f44b7dfad9d91049
font_02_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 17424 bytes
SHA-256: a9adaac4df9d50ef1835a5308575de71cdc0711d5cca5ea7574dfde7fd640234

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