Malicious PDF — malware analysis report

Static analysis result for SHA-256 99846b14b744dd35…

MALICIOUS

PDF

81.6 KB Created: 2021-10-12 21:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 481e48447fb4131721abf9b960f16519 SHA-1: 1b3ecf61e4a83238f208d98cb17245b34f8cea53 SHA-256: 99846b14b744dd352386323f914d6178971457b40569111fd268bef23353ee4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to PDF files hosted on various domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these rules identify patterns associated with SEO poisoning and compromised hosting used for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://astmasme.com/userData/board/file/nabisinuwofonusosijozag.pdf In PDF document text
    • http://qianxi.cn/filespath/files/20211001024410.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210915145223.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/3411318983.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/39771867840.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/22062471183.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/85156179220.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/39688308191.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0fb38fbdf8fb138df78b633978424e04/zunamubeparunugus.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/82516498055.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/75321383058.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/wejovadugesavonuf.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7355f78619bafe4e133adc9f919bebbf/lutajujuligofug.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/vogoweneb.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/51230053979.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/keborulofavuvir.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/zedusapa.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/pegeval.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/rarom.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161616b9a8c364---8628009080.pdfIn PDF document text
    • http://cpils.com/userfiles/file/razojijufabidusato.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/54543169283.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/welixuwojotigikajise.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/zevewetaniwuzigolozuxe.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/EqozwcbAC44/uplcv?utm_term=1975+maybe+i+would+like+you+betterPDF 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_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 10976 bytes
SHA-256: 7f822437198c21d0c0fe33b0bd6df63e20f684c48af115a5a971170e83175e77
font_01_sfnt_off0000ee75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 19756 bytes
SHA-256: d1973bbc4090edb4eac660b5a9ed8babcd118fb2f978d43f51d67bc07ec43870

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