Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd6b45c32165562…

MALICIOUS

PDF

113.0 KB Created: 2021-09-07 09:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2a1bbca36c4727aa81b2e189c7fcb650 SHA-1: c740d8db23e96095fde603a3712291082f818a55 SHA-256: 1dd6b45c32165562a8169f26fa2e23ce10ef1de967917b69f742682a1ddbc00c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or hosted on disposable infrastructure. The primary goal is to redirect users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://smidgel.ru/uplcv?utm_term=family+law+act+1975+%28cth%29+pdf PDF link annotation
    • http://xn--9w3b11kh5l.com/ckupload/files/69081567993.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d3cdac3a3ae775bbdd4823c13f0ed7e9/dijalasilu.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/mufiwixakiravibekuxapemuz.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/toguvuzi.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/25189470504.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2613d329ce---kugapotuzogefo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/o633r8128pj8ri9isepmpjuj97/95480337845.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/34339756046.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/b4ov8re406jp9kpsarvm7g3aeh/64314172042.pdfIn PDF document text
    • http://recrute.fr/files/files/gerazanudana.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/74132099147.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/8090597419.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c22096ecfc0262e972c5b31a75e8efde/jugosaxobu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160887b7eaf80b---1630263969.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/pozobilefonozavad.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c30a84b7e2d---mosakadusorebababerobebut.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/ribusuzeramaleje.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/gigofepisureweb.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/suxanitafi.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/25834358373.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/27111800664.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b805e8d0a---bawedunes.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/64864325755.pdfIn PDF document text
    • http://emannsltd.com/userfiles/20823931211.pdfIn PDF document text
    • 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_off0001557b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1557B 18192 bytes
SHA-256: e0f692c95b34897373bc8a0a331e5c40d48f80a42445a1cb0857c60787917934
font_01_sfnt_off000183dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BF4 10996 bytes
SHA-256: 3434dd8422cf03ecd7249cb9fee6c35b83dbcccb12928b2ea3c075d2624ab240