Malicious PDF — malware analysis report

Static analysis result for SHA-256 958debe6816018de…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 12:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 169774fa6bcc81eede9fce245009f6a1 SHA-1: f709ac785b6947dff8e235fc6cd03391bd994498 SHA-256: 958debe6816018dee0eca28c515426846e7864694736a7fbedf19d92e2109960
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress upload storage or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://thaoduocquyhiem.com/userfiles/image/file/13510832583.pdf In PDF document text
    • http://bakefruit.com/uploads/files/202109072057541541.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5af9555867fbccb80f149e19703fe39c/91737129796.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613099630900f---52915658388.pdfIn PDF document text
    • http://wohingltd.com/userfiles/62150234690.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7fd61d1ef---82987667772.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/43060158824.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/sategurogagimuferaza.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090810003961.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/78815676403.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/bezixofijexovawe.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/nutuxatedoworud.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/21141088335.pdfIn PDF document text
    • http://kco.su/userfiles/file/ruvowenumexal.pdfIn PDF document text
    • http://biomehl.com/images/content/files/jaguxigezagud.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8f72b227---31185696581.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a7cf6f1c9---gobezamevututiviwofimup.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/zireniroxibajapijenotez.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/92082268448.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/4274553796.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/40263824920.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/xepukojerizunadiru.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/kelojega.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/nobarewelusoxegatob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=samsung+stackable+washer+and+dryer+manualPDF 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_off0000d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 11212 bytes
SHA-256: cb23b079e55242910c658067e241b60c1fc6906431571ade2fe7fb7ab0485a0a
font_02_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 17712 bytes
SHA-256: 02ecf2d6b5762e542c3f1c65a8b73aac1d987f1e4ede4dd3d3d454259ca088d5

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