Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed52e4d9f041a0f…

MALICIOUS

PDF

77.4 KB Created: 2021-07-06 09:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 501df8db9736b533160d6c21dd997036 SHA-1: b722cd4dda229a5d5c7afe2a03ec26b0d08e5d56 SHA-256: 6ed52e4d9f041a0fce773dea3ba112f3b2dcfd966176030b674ae80ae36a92f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URIs and the nature of the heuristics strongly suggest the PDF is used to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://huntic.ru/uplcv?utm_term=tom+and+jerry+comedy+in+tamil PDF link annotation
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06fa5d5313---76701750824.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/ledopuwetawonaviri.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/51102695383.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf2c0d9c3---67058719024.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/md7oaua2q286b7ml91ej960mgd/misenofijuzejuvomatu.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/wusuvijigulonutimufa.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/faxuwidukin.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607464a893352---17141540080.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/52439916600.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/dotozojo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc12f624b7---5091865611.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/15357505018.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/17180191216098608b83d7f.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/movudimurazelefinadurise.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/19279985227.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/gituzixir.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/78a60d8cc1749274fab41750f431228b/26165870151.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9b4a64881fead521b2143714ca838c97/dejoj.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b3328b6b7---susidiwekenukep.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f83af54a43dfaec1b19d71ffeda03562/liwoxipaku.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f3cf0f267b0ae8099bc6202050423f97/vatujuxaso.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210624112243906252gp5bv06w9kgl.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/71687806185.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b369a47e---xipitosodebezivi.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_off0000cd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0B 16460 bytes
SHA-256: a7773f4150992ec2346c20a9ecb1bf8e1243a936c79dc3eb068729c8b57dfbe2
font_01_sfnt_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 10572 bytes
SHA-256: f6e7b142adf0f509d3205d0026575844dd6584025991fb7228ec66e024538fef

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