Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ec6b4f4358306b…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 08:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36398bad98a0c1c3d7fcdcf76585e5f9 SHA-1: 070ca4710879186a9a6088914a587c492499a1a8 SHA-256: a1ec6b4f4358306bb3a6f0df0b29ae7413733d9c267a51dbe210bdf8945af466
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://infrive.ru/uplcv?utm_term=minecraft+account+list+2021 PDF link annotation
    • http://www.medicellbank.com/userfiles/files/rupuwimer.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/revafadelamujegogavifig.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/336769008.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vq6m4k47sk5s9ibopt7dahln99/13638977547.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/83574855361.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/diremitevedegu.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/38578897106.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/sipana.pdfIn PDF document text
    • http://agmapure.com/upload/files/gakuxuzuvo.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/17665565628.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b9b12663a6384464d90e7620fd493083/bevizozogisevuguni.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1656889b4---saxenawunuzu.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/45554321031.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/degiwuseroxefida.pdfIn PDF document text
    • https://drlanda.hu/user/file/bofopaferawegubojarotoj.pdfIn PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/begoziviruvinaselif.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/gaxisirolajilegujup.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/dajokewutedutisufet.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/85222067216.pdfIn PDF document text
    • http://didopack.com/files/27047053081.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/zidufewemu.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_off0000ad29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC540 10716 bytes
SHA-256: 9228daf14f81e88bcfbf4ca875b130c9b8fd4413662388a7c555e25c4039f6f3
font_02_sfnt_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 16568 bytes
SHA-256: 4e6fe98a0d4fee345aea054644331f31f2a928691f28c1bdd0789a3acb8e481e