Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c339cc082d25ec7…

MALICIOUS

PDF

88.2 KB Created: 2021-07-04 08:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 77710ec95e070f748575abd0fdf768f0 SHA-1: 22339527a9050f16f38cec29bd362f14e88c58f3 SHA-256: 1c339cc082d25ec79c278ebcdfc8afd65c0b2d44d7898238db81e31877d8ddfc
196 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a social engineering attack, specifically a 'ClickFix' lure, instructing the user to execute a command. This technique is often used to bypass macro restrictions and download a secondary payload. The presence of numerous links to compromised WordPress sites and disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acdd6b6e46d---31681757276.pdf In PDF document text
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/1754759835.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/425bb1a6fc3c410011bfe66a52266b4e/13910071557.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb4a4c54d---nifusajupe.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886d9cdb844---27717469255.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5c9361e99---32919906320.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6a3773289---3509552537.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f091de54e---62799922959.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/bakadibut.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/lulokivamijol.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/8fb51fc6f5af585acf68a645dde33d02/92142921889.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd021169a7---bomot.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/86949086799.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ac575b400a82efc5fdb771184372669b/dozekilosolitibolelivubev.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160949877574dd---66957919826.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096298c8bd0a---67147107626.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/ririkalovemabozikovuz.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d793bad7aa38c55895cc0af239d417fe/golejajuzuganas.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e403651934---venibenonukavo.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/aa25e3e9a7f373047e48199eca26e013/35446724023.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/4b6ce2d76aebef8e19f42a40b56ff07a/89594904444.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/3hdukg2802ah13ph1os6h4trf2/zutapolebikewife.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210628092610.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754bd4195b0---73736776325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=windows+driver+not+less+or+equalPDF link annotation
    • 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_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 10632 bytes
SHA-256: 3d5e40e28f78b2e368d4709657e2c039df6018d4ddf36e058192c8b4a2986929
font_01_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 28264 bytes
SHA-256: bf45643850bfcb4dff8c8e80c6ceaa26af995b90889638604c824f88cb62cee3

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