Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbdc88636d5f520…

MALICIOUS

PDF

85.3 KB Created: 2021-09-22 11:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 227d634b10c50ec672428467835f80c1 SHA-1: f442426176d64423b19c9a04cb2485e8f502e362 SHA-256: cdbdc88636d5f52087272660ba21b35ed9477d987ad0c854d57f84079daf07a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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.
  • 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://pistant.ru/uplcv?utm_term=low+ram+emulator PDF link annotation
    • https://viboot.com/ckfinder/userfiles/files/32934079589.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/mivagerejokuturev.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/96278409578.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/ropalarit.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/ruvojenodorerezoj.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161457b290f161---6960116988.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/dokanumiku.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/20741896462.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/sofuj.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/45885136718.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f0316e4c4b9656f5dc2a16a310aab264/bekaxopulowamujigik.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/40175323525.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141d8309d5bb---danitir.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/nirinovekizijamomotezu.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/93693479151.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/pewunomirixuzepagi.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109181259425652.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/tonanogemesab.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/61240147449.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/kegirokixazonepubax.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/17170891218.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/pobutalafisijuzusagub.pdfIn PDF document text
    • http://www.polni.si/Images/files/puvujibobulavinololele.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/rabob.pdfIn PDF document text
    • https://blogsma.com/files/tifinegapabopozonoxipu.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/96023686276.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_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 10048 bytes
SHA-256: e2fb3afa7c72c0cdf4ebb5e0795bdc4c648cc76cbc41ef6f743c02f1380f758d
font_01_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 17512 bytes
SHA-256: dca0067b2b3c928cab5accae7443cb24518eeffb9aac8f7c2c132e77b18fcdc1
font_02_sfnt_off00012fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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