Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2c4b084043bc4c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 10:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6639ab02cc072c1406417edc3a40b974 SHA-1: a84fc00976eecb348a6271b0fc9313894a888795 SHA-256: 5f2c4b084043bc4c6feb3c9603e41ca955e96b9253a710191287eac3551e8b6e
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, many hosted on compromised or disposable domains. This pattern is commonly used for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cn-junsheng.com/upload/file///20218565997964.pdf In PDF document text
    • http://huichem.com/ckfinder/userfiles/files/rekipigevi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3f61d09e6573e346d2e21a89f9ac7b6d/runagoz.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/8abd78722d233a54e81058104b93f9ab/84670346893.pdfIn PDF document text
    • https://temahr.hr/files/miwozuranoxide.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/xelulabisafogumigugixuv.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/pl3666tu7f43j6i3f291urir1j/95366936364.pdfIn PDF document text
    • http://simonide.org/userfiles/file/12469614570.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d38a34ec---63620718213.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca5630df57---lavedokomo.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/19150393680.pdfIn PDF document text
    • http://unsersohn.ch/images/file/mufomiresotijivirakezaji.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/16735992799.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/409c92022a4e7586f342b1e281af7ecb/82114254226.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/b37393b149c44068104c018251c27cc6/fijefepituzutoxusasile.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8a4c8831a---90108545727.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/givosukujavojerunuduk.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/8ie08antsigspmfk5h3qad7sdg/javimikusigefuvomipegab.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210616_EE0295AEC1D9E80C.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c318c62b1b---45941771508.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/benedunemamuzujusaviko.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/46812067550.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e8e50c30a346461e192a8596d4b447a3/66740676923.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/32662030934.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/22134ddeebcef4c35e64eff0c301bce8/40865720432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ulcer+diet+menu+plan+pdfPDF 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_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 17376 bytes
SHA-256: e073fecd0902bd726139755ae916054a0550a5820f2f1b5b612d5f0056988e4a
font_02_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 10600 bytes
SHA-256: fd67a9b4d51fc14fd7016e7f4c83d7f18775fbddec52f69a8e747e350e17e54e

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