Malicious PDF — malware analysis report

Static analysis result for SHA-256 2490bc612db8e090…

MALICIOUS

PDF

86.2 KB Created: 2021-09-10 14:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8bfc6ace2fa41eb8b1b74d0a25b2297 SHA-1: c9ebfbbd74f6fccfe08e0e90418ae9dae95103bc SHA-256: 2490bc612db8e090f1f178f01d11285fc26261f439e6d174fad918e293bf3fc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://oniceh.ru/uplcv?utm_term=justice+league+snyder+cut+torrent+leak+download PDF link annotation
    • https://peisheng.org/uploads/ckfiles/files/61300c642e823.pdfIn PDF document text
    • http://onelove.cz/file/65396632976.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/84639965540.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/7418055373.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/86799415267.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ac25678d8cef2146e87ad86a719c3f3b/tadodafudiboganamewode.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613232a7074ec---35362748307.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aba40293a---gulumufodabetudagefunetif.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/joxatisadonunenotiva.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/25469699486.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/72670308051.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/76df2a9d7326c7ca5119b23de52fe495/poxaxoraximasoduli.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066fd9ec37---zunikewogeto.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/71823282332.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/mupirijilorerafive.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/61354546846.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/109085c1cb38ba678728a29a59add5f2/tikixipef.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-10/20210910065418489531.pdfIn PDF document text
    • http://dr-temt.ru/images/file/6511416635.pdfIn PDF document text
    • http://sivam.pl/files/file/xidaduneponipexo.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/48717844562.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb8662c40---84031016310.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/41396712181.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_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 18876 bytes
SHA-256: 0c59848d6fcc8201a46334731b6b5b6cb0edef23aa7c305e56b275fe925f4dbe
font_01_sfnt_off00011954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 10928 bytes
SHA-256: 13202fb101b2b3e87deb8485bf979f3e44d203474cda2c7607363b2bae054856
font_02_sfnt_off000132ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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