Malicious PDF — malware analysis report

Static analysis result for SHA-256 496142631d2396ab…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 22:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0260fff956c34c22a4dfa21b7f02ad50 SHA-1: ba2a5cc886206a1b99be8e063fa8f2da9204bb39 SHA-256: 496142631d2396ab1d7bc5bdf42a69413866a9bcb4603c7d33422a74999641e8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of multiple unknown URLs further supports this, as they likely serve as landing pages for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdbe4d5b42---kidefad.pdf In PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/88339ca5f7e4b5b3d3756c9b84e58dc6/tutiteramijikudixojozomet.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/10108233071.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/28aff455f6443bd31a3260bb11428b22/putawilifezekusolab.pdfIn PDF document text
    • https://argumentua.com/i/file/42495126841.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/106b7a61a5c997931655c42f724b067b/75826835171.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c8aec773a---51571195281.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610729d5b261a---kisoj.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b090f88bad8---xizubak.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/vagoxowepidilewedokip.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/2284784318.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e79a657e18---dugiris.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/41984043435.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/zofuzim.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b807637437b---xevofuwivonegisuguzurepar.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160841f2c8e854---45495922525.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3pe9ehf8ad3u2uj8fj9ca06454/26144426657.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/61598741308.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/819d229314e598a7017585473f9c0247/12544870371.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/fixilofukafup.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ddeb57474---rafupizewitelotubemijure.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/zuzitelaremufovixuvov.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/71295744184.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608de0faa07f2---kidetamikunabotede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=remove+and+add+pdf+pagesPDF 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_off0000c712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 16928 bytes
SHA-256: 03d279f22b05ef80e86882682d764772232a68afb99c3af7077a03d77c9e7cce
font_02_sfnt_off00010ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB9 10616 bytes
SHA-256: 00fd27091b775241f04c4d6577b8ae3dbae8d533b178a82e6a06a5529cb0e87b

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