Malicious PDF — malware analysis report

Static analysis result for SHA-256 7764e971fc008038…

MALICIOUS

PDF

81.0 KB Created: 2021-10-05 08:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2a598f84097efc5eb08b9254e2c2131a SHA-1: b77c0ebcbd613af4497fe570af4578c5c98d3da6 SHA-256: 7764e971fc00803831561b801c9084f5dd3a0a38b60a3ec84b0ccd357a90958b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://stauarchitetti.eu/userfiles/files/97102190195.pdf In PDF document text
    • https://ncsccalgary.com/userfiles/files/83485860964.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/31524709544.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ccd5a1b66b---wurekarutigexukonorudaxi.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/rezozuzalewukiw.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/subemiwido.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/78022765063.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/lutirasimupuweviri.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/34823432148.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/kikoxewunub.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/11493441577.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/52768628668.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/bezapinutubajurivuwin.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a099617767440edbfc9af177d694b2b8/jupal.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/t2gome8ru2c8j207ouf9kujdm7/liwulag.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-7/20210907235914816074.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/96174597294.pdfIn PDF document text
    • http://huarong-bio.com/upload/files/dofezimukakuzun.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/jefuxamaxirera.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/pupufum.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/30443570783.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/n9ia66a3s91t09dh31bnj4g68a/nugited.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/lovokezuweka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=preventive+double+mastectomy+and+reconstructive+surgeryPDF 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_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 17652 bytes
SHA-256: 4eff15589445bbc7025c53a76adb21ec4ace0b19a7ff9a2a28f5bb6605c08693
font_01_sfnt_off000103cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 11136 bytes
SHA-256: 98bf44dfcd8227e29c3570b2a285cb7df1409f99ba17b6a006cda4fc641b97e2
font_02_sfnt_off00011da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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