Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c624118e492c97…

MALICIOUS

PDF

83.9 KB Created: 2021-07-02 00:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 56653600118aaa9a93d851e2a5b40ec2 SHA-1: c8eab4b7a77aea38d8bfac1b34591e311590a656 SHA-256: 02c624118e492c9769752c802ab948bef855b1b02a30449f2512ade94efa01b7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination or to leverage SEO for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b25e618d6e---wirovidapid.pdf In PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/40427493686.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fae5046e9---saluwop.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7ee47de7c---rakagizujezubunabidiz.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d02d22b5867---lurekupexes.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/mexirenabowekatebudo.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0d650ae911e0a9d820efb0e6e6fc5f00/28410999519.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/e2c99a99eacdd90a9c2e04db2f2d9c31/sebusexufi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adbec650ec---78042764377.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/bojenazuvorevasegokew.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/241323296884.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ded788c4---wimamukavetelinipaz.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/undvvns1f7gfrgv6cca8iu7nlq/72423588157.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a026a7f1f88---18029196606.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74daf421c2---87387025065.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f423d70920---vozanuzax.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o10f90io3o3gbof469nnq97jn6/jewebivokiwufuwibibufajak.pdfIn PDF document text
    • http://temple.mo/userfiles/file/20755083300.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/ditewa.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/77008461229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=online+learning+ppt+templatePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/36744012577.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_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 10332 bytes
SHA-256: 21286e2dd5764d786c939ffa32b4efac680e6bf5f568f0dff448daf3bc56d285
font_01_sfnt_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 16676 bytes
SHA-256: c414c20098604e0bde0fdc76c924f3ac34a758ce5ff52de2dec78cadf382cb36
font_02_sfnt_off00012aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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