Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc20852f9c2e4dc…

MALICIOUS

PDF

98.1 KB Created: 2021-07-03 11:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ca4549ea5efd6dac85aca820f4a70bc SHA-1: 44b48ad36bd121771571c6b13da15154b643db90 SHA-256: 2bc20852f9c2e4dc2cecc304421cddda176604a1b8af4e477d3272bb2fa96e6e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ee7r3rauaqhhobamb9n025iop8/kusufusipew.pdf
    • https://ascinfratech.com/clientprojects/trading/file/pavas.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98f7dc455---41463730763.pdf
    • https://stopserv.ru/files/file/tegigujekipibuxebiset.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7bdc3e109---nomuxugorumav.pdf
    • http://solee.cn/ckfinder/userfiles/files/26360018112.pdf
    • http://goref.ru/files/file/39494630364.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/96446587706.pdf
    • https://renault-service.com/userfiles/85538902253.pdf
    • https://vgi-vn.vn/app/webroot/img/files/gekexisilesufu.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/lubkhscukp7qm41qa8jd89e4ag/kokuvujen.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/e497fb8fc47d2fd87e329d6ddab36119/zimesowejogetowide.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6fba6f4bb---muwabikoz.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/f221a124b257831e7f59ba6c150a9b94/25851559075.pdf
    • http://epoxidice.ro/mm/file/87495410384.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0430c433---varixiwutawufibomele.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/fatepedisinobezu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f426c485b---bapipizoviludejovofer.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0ff36c2889817497a5c89f520cb8d16f/nugigewuzefetigafo.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/0d047f3ec69f1e8bbe53eb0cd464d368/79570130012.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a0016c57efaa179f1d22530f7f164fe6/judopivinidinavutusuni.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c794e9a30a8---90455245077.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9977ee108---xaliwi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=85610+prothrombin+time
    • 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_off00011a53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 16792 bytes
font_01_sfnt_off00013265.bin
90b5d3e08bad7902af202764338684e19d42e0118a5fa339c314ccd33a223097
pdf-font-stream PDF embedded font (sfnt) at offset 0x13265 17692 bytes
font_02_sfnt_off00016111.bin
287a0f65ea7070d9486f3cad482a3f7a2ab80626eb3a9850be855608cdc2c6a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16111 10868 bytes