Malicious PDF — malware analysis report

Static analysis result for SHA-256 931a7c6dd67710a2…

MALICIOUS

PDF

142.2 KB Created: 2021-06-29 06:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 490853600a10961459f13a274bfbdf92 SHA-1: 3ba4a4f835da001e62fa47849f61357e84234474 SHA-256: 931a7c6dd67710a2b41e0fca26b1a5ed2a9e6a5512ff81bee258ec958fa85610
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine rankings or distribute further malware. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9081

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://przychodnia-felinskiego.pl/uploads/editor/file/93480239254.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6782f3050---44695545329.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/91102012242.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/703bf6a5ab4659a4f60eeb22f77fa987/nunefawuwivaremovedaz.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/18c17d6727f7b10e1b1cab9391e9a49c/28096917296.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160892e7bd50b7---91498496953.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b17822bd9ef---15746388540.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0a720b8ad---puzikepudexagizazabotu.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dtt0tk8vrem2qd05jg4k6omse7/78128782455.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9713e1401---vufakiruzuluzok.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/88474189762.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a0d1e81f---vikawodajekisa.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c852c53303---pivafijabi.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/km37d0a6iqcqgdfjja9hgp1uk0/29216036997.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fdb046c42---gaxogulafajaseno.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/30209936525.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31cfa1da8d---49618228062.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/14973744902.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b63945415b1---vudekitekevagifa.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/medobajajafojekegi.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/sesug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bceb7e989d0---92151848282.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0efc23024---11782662708.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/rujodogipopetuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=meaning+of+quietestPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00014820.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14820 31460 bytes
SHA-256: 53f25f6eae1d9e3b7b52fecd0eb3e319798a83af028aea9369ee84cdca2cd8f9
font_01_sfnt_off000182be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182BE 13400 bytes
SHA-256: c4e01e05a97479f2974cbe3bbdf20ebc32a0e04e40a0b8e7acf3c28e5578baa8
font_02_sfnt_off0001ac8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC8F 33220 bytes
SHA-256: 1555266053ea74090f19095bf73fa3f98aa5eabaaae2e88c268ced96b5f55192
font_03_sfnt_off0001f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00021157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21157 10484 bytes
SHA-256: 7738cc197f169c5d42e91be391bad0ca1c7cd68e77001269ae7e7192bad09ed1

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