Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cd639c7f984b7e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 08:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55775a88fef535cf888b111957bdb786 SHA-1: 87785530f0fd7d6b43891e5cd9a581ccd401846b SHA-256: a7cd639c7f984b7e2e6e4927959409656d4ae73105319162ecc6a9b805d83f5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

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 https://oniceh.ru/uplcv?utm_term=salem+witch+hunt+book+pdf PDF link annotation
    • http://www.enredmail.com/templates/files/idCliente_/file/mafugiwazeroteterewubajo.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/54390587420.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/verovimenupo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16109627d2165c---61284069285.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/37843631891.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/62197220236.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/ripitudawumedeb.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/nebarowisudijotu.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/32123152705.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/vapowadorufanajepote.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9insu85dn827rptqiebafhktf8/55194542745.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/lobebikamusomipizipere.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e2334499e---38373742308.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b03a52af95b---zarokogakojabo.pdfIn PDF document text
    • http://firegallery.ru/img/upload/38027624445.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/komuzimegetexew.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaeaa4904c---wezitax.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/kotenipiwupezi.pdfIn PDF document text
    • http://chayka-svg.ru/files/mizisijazozulufutil.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/pegesodogofaruzono.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/44090024669.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/tusewetililuribaluzab.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/75423241671.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/1008067064610991270091fa3945e64f/31809191066.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_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 17600 bytes
SHA-256: 31a9add6f18e3ca51842378407a46faa91b19fedc19b45b672d2922bad8ab0ac
font_01_sfnt_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 11112 bytes
SHA-256: 26204301f09a840515175240c011f87291830c2289c0968f9536a3ac39691a99
font_02_sfnt_off000123a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1