Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf0e57752ca2790…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 12:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ad555d906d1fda16d621deeaef8665b SHA-1: d4543ce6da50d4721964e49be18901ff1964c8d6 SHA-256: 9bf0e57752ca279020771406584a47471aef0fd05200047f44a8c9d3eb0bf782
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various URLs hosted on compromised WordPress sites, likely to deliver further malicious content or conduct phishing attacks. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de34a42657---89666475490.pdf
    • http://yacpa.org/yacpafiles/file/5206024221.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/1ql6pni98m4hktbvgmo03751oi/46983701351.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87799b06d9---64567643203.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/7c174b841104acf17fcf7de71dce9006/bobigalisofugula.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/4bf7b5f2d08e2b1b0029bdb4be4c2050/68718533126.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/aaca3km3rk3vpankbic1k6fm20/95935368169.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/64737980412.pdf
    • https://pass-eco-energies.com/ckfinder/userfiles/files/2727947429.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a16940c0fb0---vixoxafapulaxelo.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083873ae509c---58548863729.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e006a67446---kokuzak.pdf
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/22866560401.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/71bed565a2d7adb61d99eb05d9e00839/60718340858.pdf
    • http://churchtextile.com/userfiles/file/lunopuvufoxoxosabo.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f13eb635353195e5164d2f203bff6f44/xoleribuza.pdf
    • http://jfac.kr/ckfinder/userfiles/files/jelanip.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c344c65a166---sitozebugozutofumitiworir.pdf
    • http://vasvaripalmuzeum.hu/upload/file/doxibukat.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54e526bf28---mifotiziru.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160876ff640f80---3338047447.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4ecd65e26e84e5e8ad3a6b9f2362ab3e/zinedawanafukala.pdf
    • http://altaprecision.com/userfiles/file/8462037955.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b1842d039287bcc52952e2e4f1ef2bd0/nowokikunuwugamozaputego.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/rireduwobatifokomulafuraw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=deep+english+words+with+meaning
    • 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_off0000ef66.bin
60771484d0354f0c70dd94c50669ea6d361db756e30338369e530e722b66ba9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 16532 bytes
font_01_sfnt_off00011a0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0A 16792 bytes
font_02_sfnt_off00013221.bin
1f62129d0b80f6a2a03dc330e9fb0009150ca0fe9ea3172c56cfa48850cb2eea
pdf-font-stream PDF embedded font (sfnt) at offset 0x13221 10928 bytes