Malicious PDF — malware analysis report

Static analysis result for SHA-256 20741d7609737810…

MALICIOUS

PDF

87.8 KB Created: 2021-06-30 09:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95033be4e4c767f6028e9a1cd4dcf737 SHA-1: c322831342bac49b80f8f08a83087baa78781aef SHA-256: 20741d7609737810f2842bc617dead446f8733d09b4ff1da929ff9f26b15f8d9
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised CMS uploads, designed to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae71a883c8c---81279957023.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3936425d6bc7c8979e3c0feba183be70/4009727471.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2aba5967f---6268816564.pdf
    • https://pmms-online.com/assets/file/kebanet.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751fcc0350a---kefufimutizawomodusun.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/8j2gb6v5pv9v6q1mo0reckb586/nonibepamamuxa.pdf
    • https://emauto.lv/index/images/up/file/47979302486.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20376acfe---35763320344.pdf
    • https://abofahed.com/userfiles/file/2577565347.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed9c541ed3---jemijivinewujurobe.pdf
    • http://kolaykanal.com/userfiles/files/sojajogutanewizogumijeji.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/98321424571.pdf
    • http://ximangsongthao.com/app/webroot/uploads/files/31590777315.pdf
    • http://cloverpark1959.com/clients/51168/File/fajuno.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/04a9ebff39917c2f36a7d73e124b2153/76499122725.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d5b15a89cfba483c924d70a8c5cc73eb/9756171050.pdf
    • http://euro520.net/userfiles/file/1622501580451615345.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/1cf49c379e979d8bd6b24bde0d6136e9/febuxafaveran.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9f08f2a09012ad028c029667a8ea18e0/28616482020.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tudiwune.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca6b80989---7214225974.pdf
    • http://tubietelbar.hu/uploadfile/dogimugok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fanaa+movie+download
    • 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_off0000f73a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 16792 bytes
font_01_sfnt_off00010f51.bin
15330176100a9996406802bd6bf3eb4e6bfeaa58657ce4b57597325f308ef7a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 10172 bytes
font_02_sfnt_off00012602.bin
189e8ae1586871f2411d5480b8c1e5a4c0edb440bd548d241c62e68d1b25d62c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12602 17132 bytes