Malicious PDF — malware analysis report

Static analysis result for SHA-256 92874ed8982ed880…

MALICIOUS

PDF

174.0 KB Created: 2021-06-30 05:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ed3c23ebae8bd3af905286e8d8e3501 SHA-1: 4233a37ba427801f6dc31f5a7717cfdf3cdfe189 SHA-256: 92874ed8982ed88004340164212b65eeef68909b0b86c97632e13d6c5789e284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristic firings strongly suggest a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://crewmak.ru/uplcv?utm_term=systematic+approach+to+daily+practice+for+trumpet+pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a46dab95e41---wasaz.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9bd9d770ea8550fd58799125b7fb09d6/deporesexidor.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16081e071b8472---83813427730.pdf
    • http://instandee.com/Images_upload/files/tomumodekelosatadapovaw.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c963de0e4d0f22e40945f5d4138cdbb1/8942936135.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bb6b373b0---83084593178.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/pazawutanezoginifora.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b24137def---zomofo.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/1os7nhh8kobkjjkj4u9apr2flj/lewafumawusup.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077f60aafac3---1862897927.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bdc0640a9ddf8dccb36852544790d3aa/86309630791.pdf
    • http://parkhigh65.com/clients/4970/File/95663809489.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8c79ee42196b58b0052d02d4a24743f4/paleditomobafomivamaluxi.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/rogitaxoga.pdf
    • https://alianzatours.com/imagenes/file/lukuzekivovobagupas.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ipgdkucfuaascs0ckgmj74p5p1/370666660.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a706f5ba0b---balevoxejagajalu.pdf
    • http://applexin.com/ttpsea/files/file/makojabamapesamot.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/5krlie6d3l2jjen8lnktkd6lrc/jalomegixukubogulu.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607005db140a4---95847700062.pdf
    • https://nepalmicrofinancesummit.org/userfiles/files/vipipusevolutet.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160901b669b3fb---vokixuvokovajilafezefi.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/o3ttddcqvmctq077cj7hhr8054/96678041765.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609476a389bd5---jatipamazuworanil.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022054.bin
ae2773c221679a56edf244d678f0cdad8378b8bc21cdb97027ea2b5f5e74952e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22054 11068 bytes
font_01_sfnt_off00023a22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23A22 16792 bytes
font_02_sfnt_off00025233.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25233 16140 bytes
font_03_sfnt_off000267ab.bin
e539ba58325600bad1acb0451de651c6e7df7ed94dc1379b68fce87cd7e88e6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x267AB 26464 bytes

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