Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c997af302189c8…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 01:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e299df58fe68b42f9916bfddbc42690 SHA-1: a411d61f10ca36d0eff121801bc80dabbf9435fa SHA-256: 17c997af302189c898f27d52b661c0fc5f9950e332637a59f6236fd6b8d17fe7
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves tricking users into clicking these links, likely leading to phishing sites or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad3b47131---xelukudo.pdf In PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb79dbe29b---katuxa.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd24221a67---35667124638.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/03ad8cd9aa29f70311a87a093d2c8204/27997955388.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/772fabad54407bd4e72ca27bf7b4d496/rakitoraxuz.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/39259089733.pdfIn PDF document text
    • http://jonme.net/ckupload/files/movavepinugute.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/mizekafo.pdfIn PDF document text
    • http://bougerpourstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/23536177921.pdfIn PDF document text
    • http://apvn.info/userfiles/file/88627610571.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/9dc6b9ed5af2ae5626c9118aed666f47/16202991519.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/lesusivewikonajotinov.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/46489435167.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cf55hhm6kodk6fj8a6ql4apmer/60242682284.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210628142821.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/19178246033.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/87200621081.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160850c2de7d61---68133092015.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b7ac559ca8d6c25e605b57a4bc62be6f/xamewebelitagazarenu.pdfIn PDF document text
    • https://armenia4d.com/contents/files/39561356179.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b09d503ceef---5848446937.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ed0c5869---ponewomeledavewiw.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/gesodenuwagapaxebeliro.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/gazepona.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba53e68af9---xuwefelajutaduzugomuve.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/zugugires.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=livro+de+direito+autoral+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_off0000cbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD4 19304 bytes
SHA-256: 8e16189e0da9ffd8f29b44629872b8e91fc8a3bcbea6f7f610d5961bc531dff6
font_01_sfnt_off0000fb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 10340 bytes
SHA-256: 681dd9e1ff3a17bb62dc413d759882dbafcda6f4965212fc9e69ebb82aa09e47
font_02_sfnt_off000112ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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