Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde2508e33ccfcba…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 15:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 424a4234cf7271c9d780ca5587206ad5 SHA-1: 79d20a399571e2ae968db65e288c88b3418cc988 SHA-256: cde2508e33ccfcba441eb840800ea6843cea01005b2b8d0ff8cd79aafae878a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, with several heuristics indicating a compromised CMS upload storage and disposable hosting. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. The primary attack pattern involves directing users to potentially malicious URLs hosted on compromised or disposable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sbriz.ru/userfiles/file/41650595949.pdf In PDF document text
    • https://aneri12.cz/res/file/78215349453.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/jelikedunupab.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/13960563610.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/lavuxusilogu.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/pagisebawipijozanejudo.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/rilakeselorupasaxamu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/42450899702.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/litabibedevupilelulil.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/zobomuvolenuroxuroge.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/borixulonofa.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210910023026.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/41802389393.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/12189645473.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139377bd60cd---89624342946.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630721438.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/87747761573.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/57556118381.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131932a30b6c---8105731657.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc0012a5c---23909285234.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/13308789117.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/leloj.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/satikefezizuzomuvasu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b89d95ec4---mudawesuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+is+bixby+on+an+android+phonePDF 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_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 10792 bytes
SHA-256: d512951546318af65e7379cb46ede8c528a5967d1056c3f07a782ef76530c74b
font_01_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 17620 bytes
SHA-256: 96bbbfe464733eef50ed9d6ff9c6f943f37a3d5d7e26a557e7134820309ffac8
font_02_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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