Malicious PDF — malware analysis report

Static analysis result for SHA-256 109525dbb976f285…

MALICIOUS

PDF

90.1 KB Created: 2021-07-04 23:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 33586b8245af53314344648257abf74f SHA-1: a3d614caedad2ed696245f604b3a3598d6bb7aee SHA-256: 109525dbb976f28518f3d8e2666cd6293fab3cc0b857d751c008c1f588943bd0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories. This suggests the document is designed to act as a link farm, potentially for phishing attacks or to distribute further malicious content. The ML classifier strongly indicated maliciousness, supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160904cbb765e9---tegododaba.pdf In PDF document text
    • http://weberstellen.ch/userfiles/file/86065344063.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/e943nao7sa9aitktl5ir5vga9q/1503232534.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2e51f94a136a751963ecd0d53d5126e8/gupolixozewowuj.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/28012330493.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/84111045945.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/5upfad4m2gh9s1vjlgbv8h5gi2/19587637062.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6afd44ed5---41046496326.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/keduvatudokuwiri.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a480a9518---61780715917.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/u3qkm0h3ru9lr5bbdpvbs11rno/88172927974.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ec8fb9550198eec708a94860d576e6f3/78668170658.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/fefeb16a98a0c71f6c2dfef89789c91a/61444663374.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3f910fdb17d9f1ae16c1ff4c9669740f/44869517111.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/88393672592.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/sunafibosi.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/fexefusas.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/0f0pu8gaicpb3heh3ejo3gfd5u/nazaviparukidimolopukeb.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/sekapewopebewisibe.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9cddc4dce---29406236156.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/vaxupewisadobafolas.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4560ae1644---84667004209.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/q3iofoprkm00f2r8ses7hng9l2/14249848739.pdfIn PDF document text
    • http://sgpeo.pl/users//file/51191640988.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/df1034390cb8878b86e3a0af412f9861/wesekawopogosuzirupekuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+combine+files+into+a+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 17836 bytes
SHA-256: c4d40f49436a24f7f655f1acf7a132e921646e1e59c6c7e19fe1788b95585b26
font_01_sfnt_off00011e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001368b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368B 10900 bytes
SHA-256: 4314554755bb00578c662b8cda9aa6ae3f1b7825c6d67b63f0238693ecb52194
font_03_sfnt_off00014f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F82 2580 bytes
SHA-256: 605ebd78575fd506cc3c788547578997dd842c5df2d2ab94acb870a6be26c796

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