Malicious PDF — malware analysis report

Static analysis result for SHA-256 914b1f35139a71b9…

MALICIOUS

PDF

86.5 KB Created: 2021-09-20 19:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a593e161355170b624ef44e1c0974766 SHA-1: 6db38977079c75487764ac4b2c020dc5647d2e11 SHA-256: 914b1f35139a71b970958f6cfae46d592644b36eb391b6729670e7f2e1122908
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mimpidia2.com/contents/files/67622637439.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0a8c5350028c3de3f3c26df2a765438c/52400291967.pdf
    • http://katyababash.com/images/uploads/file/46668915336.pdf
    • https://hssanesteban.cl/files/zinar.pdf
    • http://sten.kr/club/data/userfiles/file/20210916044459.pdf
    • http://alarcon-v.com/editor_upload_image/file/ranadojefojetis.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143df00cb0be---10351314951.pdf
    • http://risorsaterra.it/userfiles/files/84307132004.pdf
    • https://amigo-shop.105h.net/upload/files/zonogogugi.pdf
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/fazikapolekakofaxolovivid.pdf
    • http://bnblspecialities.com/userfiles/files/86741728488.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613841d02611b---xubopejesib.pdf
    • http://sevoir.hu/uploads/file/xulekuvevex.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/11674321099.pdf
    • http://palazzodiaz.com/userfiles/files/57734320556.pdf
    • https://agrilaui.com/userfiles/file/53690338435.pdf
    • https://aspirecambodia-edu.org/userfiles/file/pokijufirunasopinesigikur.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16319820630318.pdf
    • http://pc580.cn/upload_fck/file/2021-9-14/20210914145512762864.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613852323d8ea---49661857472.pdf
    • https://granitnet.hu/editor_up/mipevakejorida.pdf
    • http://halongbaycruises.org/upload/files/36637222160.pdf
    • http://clinicaveterinariacene.com/userfiles/files/55282559316.pdf
    • http://pc-driver.ru/userfiles/files/87857132339.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/600413bb3521bde96a06f0058199e76b/zajawapeli.pdf
    • http://weldingplaza.com/files/file/nuneregu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=instagram+unlimited+followers+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e814.bin
1a86a77ca42b169bc435096fc92fe98772866121743a3f1d15c9aa04323525be
pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 11072 bytes
font_01_sfnt_off000101ad.bin
07172af627a45e47fa7d46835e9f75475431f7aa5f437187f561d0e154238f06
pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 19268 bytes
font_02_sfnt_off00013436.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13436 16792 bytes