Malicious PDF — malware analysis report

Static analysis result for SHA-256 becbae5a293b2c37…

MALICIOUS

PDF

72.6 KB Created: 2021-06-22 11:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0165e34cd42f545e02aa9e548237c40a SHA-1: 1d8f9b5a6c180da1d270f16bb945f42918e02a31 SHA-256: becbae5a293b2c379ff2b5e3406e9ada05619ab8a09ec24629570bc5b14b1f95
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to mislead search engines or users. No scripts were extracted, but the primary function appears to be redirection to other hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://gagutp.com/sa_upload/userfiles/file/20210606112139.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a79855bd88c---vejanujodisoworika.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e2d77c71c7d1d4c80a7587c104da92bd/weduporugudezov.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cb814d62a68dd08917c76d73be7e1f4b/budemoka.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895ab96ad05---datokuz.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/serupajugatutepowap.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/134344423660a11d3f71ffb.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba04aa30eb---kuwuwulirinokulewevaxi.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/kogusovofutevus.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ap0js713qcq5qgb6nm3sv71kf1/nodibewevofaxekifototogi.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/1697141810.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e405e84a3---39925356678.pdfIn PDF document text
    • http://haphadoor.com/upload/files/68191014228.pdfIn PDF document text
    • http://hasyo.net/files/file/54212823720.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6dab805e3526f1b5188b30459cadcccc/penajupedugomujufigem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=all+dumbbell+exercises+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 5288 bytes
SHA-256: b34371624fa23eec26a69d6742827d5ac5ca02ebe443ef73afaee3521ee74b4c
font_01_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 10264 bytes
SHA-256: 363c6119cb3f5efb993427ce3d8f186cffae3f4ba895e37b2142653f2007b972

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