Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fccf5d4d931038f…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 04:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4bfcac2ac263624fcf82ad29b7e9745f SHA-1: ceb6d77613fe45d3a3e09dc3ba574cc769c9e735 SHA-256: 5fccf5d4d931038f3023f29dc654507c8c04c18b3bb510387b6d21b23b58001b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm its malicious nature. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=the+king+of+fighters+2002+apk PDF link annotation
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/65211a6b4ad408e872c632ee06c02561/92613889712.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/jijikito.pdfIn PDF document text
    • http://zeci.nl/im/image/nasuxukafogalagexasimur.pdfIn PDF document text
    • https://losungversorger.com/product/file/xaxorabivejaramevewixid.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/fosozuwefovegif.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/58070063689.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b68f3aa703102ebfe14844ca96a18fcd/12393237885.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/zalelagefemerewe.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/mevizabotaro.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/zuzexoranu.pdfIn PDF document text
    • https://davaocarrental.com/images/file/zirasufosazuvabelodos.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210912_063242.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/9050d576445e8aa1279db3be5f566c4b/27426905637.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/dusanosomazusukiwin.pdfIn PDF document text
    • http://mc-opony.pl/files/file/52850478123.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/39301307768.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/7203407554.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/de66c771bea542bc6395d491a6483b8b/90371993051.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/ropumoxefuzijulepuxejizi.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/xegovare.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/99625402884.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/44022644363.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161461237747a6---wejelaluzatasumemukube.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/13972579125.pdfIn PDF document text
    • http://koddous.com/userfiles/file/pokamiguvezapipidowem.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_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 10888 bytes
SHA-256: b027735991a0ab5473cfae77e28b8ed065de4adbcac7c69c0c3ee5b344f79c57
font_01_sfnt_off0001066d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7F 17764 bytes
SHA-256: 81a753c5d019b54f72d72ca736968992f3598e54a5d08bcfb152730819f2b7e5