Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9de27bc09b00d65…

MALICIOUS

PDF

106.1 KB Created: 2021-09-23 22:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f5fde334f8b6b12fd0e6c37f15147e2 SHA-1: ac0e908b5eb93c527383460ad233bdf47fbe4210 SHA-256: b9de27bc09b00d650c738bae1e82b3ff2fa30ba3d8e854c5ef4c0520fdef84be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allytemp.ru/uplcv?utm_term=robert+alter+genesis+pdf PDF link annotation
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/35169530250.pdfIn PDF document text
    • https://geniodelweb.com/file/magenimamoma.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614709d10c6ea---66272829604.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/fetoxewomolunekof.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/jijijojopugenodedulorez.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/97804139108.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/xagunijusoxesekimapo.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/pabibukutudirivuwazib.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/raxejadi.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/bumorarozufakesekuz.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d488c7e233c2fd8716730795ed0eb1cc/nejeluwogev.pdfIn PDF document text
    • http://newshop.jp/archive/file/notagebufinotowawaluvadox.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/10566710660.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/41509098225.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/ximirolafuro.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/48552137229.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/rerako.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/12512988152.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/kotupimolekijuwodigu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c209b4d1---55630763320.pdfIn PDF document text
    • http://sinoorchids.com/image/file/rutaba.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/rizovaku.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/wojit.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/29129196815.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/tewodenapudusukeza.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_off000136b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B0 19748 bytes
SHA-256: 933e9db89f9bf26b5329c6655547d188ca5f2c47ae025241c205bdc4f1015551
font_01_sfnt_off000169d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169D7 10856 bytes
SHA-256: aea435a24aac333aec437e7dca702728e93f9f36d9d4d66478691215ae69b1c5
font_02_sfnt_off0001829d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1829D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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