Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b68009e2c202590…

MALICIOUS

PDF

85.3 KB Created: 2021-06-26 04:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a35e4dbe16d4eba49e92df64a23817a SHA-1: b9646fd077db8efc24af5f4ff59ea260ba8396be SHA-256: 5b68009e2c202590904de747d35ae7cc58514863d1a6a4f4e2fbae8b865af9d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609da90e9fa98---62517304100.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4eef43147---goruximolalumun.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082017a1a71d---wiferevuwutumudemasivomer.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608113671ac3a---tafujexezekijutapiti.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b88eed9aa7e---32776919197.pdf
    • http://beijingxinzhi.com/userfiles/file/20210621065844_582127342.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d3b0e4bccb5f6c1c6da94bc68682ac1c/gorubokadilegijibavujafav.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a06fbbcda59---50936355053.pdf
    • http://yuanyoujie.vip/userfiles/file/24054187436.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6fc59e3e---5799082240.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/p05qpm07u63rd2nj0k74te39lv/wibutojedasufarovegajoja.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609878d674162---80575985820.pdf
    • http://fixafilm.se/userfiles/file/temopoxuwur.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/d3237f69451d77e345b5191b35e0facd/takuputu.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733a13c2e89---50704925636.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/lk6pvbcmmp99p5sa5rn694rj13/tuzoveliboponif.pdf
    • http://to-kajihan.net/js/upload/files/30337376087.pdf
    • http://banlinhkienlaptop.com/userfiles/file/47460086304.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/c9ouhs4d8q3jccb7ihmfqmufm3/8844469803.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ff5768c13401c356e5180a04c858df3a/dimegosobu.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0d6a67579---duwuvurawomi.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b639acc9---dasovu.pdf
    • http://abpaluso.com/upload/file/nevoxijujogovufedabivawuj.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d8a4d2920---xiviwozarojalotope.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f9c8d927242398ed1df248a966f691b9/57040794434.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e5f62685---88197228245.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//12517236874.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=lung+volumes+and+capacities+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec43.bin
911c4354c6566d84fc9926a450a667f075b6205962ca16f6a7dc1cce1b598ea1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 16296 bytes
font_01_sfnt_off0001168c.bin
0d29e165f8a61a949f9e0ecaffc9c9069df30047318a5e5d93319ab9aad02448
pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 10984 bytes
font_02_sfnt_off00012fdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDD 16792 bytes