Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d156811ee9d67d…

MALICIOUS

PDF

88.0 KB Created: 2021-08-08 03:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03bb1c20cede4b8bcca04782cd4bfcfe SHA-1: e3171fe706da0d07c62564142a841885453c84d2 SHA-256: 28d156811ee9d67df9a565ead0f4a6dab6a493134ccab25891f4f3147eec75b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs that point to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=champs+classroom+management+plan+pdf PDF link annotation
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fitamumow.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd31a283a33---wewofipuxegumuruwizepa.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/13669948103.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/46464218576.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/josafeliji.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/janagijodisejuvovi.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/3b6fa2e1b57b8448a9cc5351fcfc13d9/gunivabolojinaposajip.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/nutukitebasukapapozinu.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/xikegimipupis.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/41271942810.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/sevolivoduropowune.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c434d99b5---bejezatijibisipetorejuk.pdfIn PDF document text
    • http://agavietnam.com/img/files/gubimufegesupow.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/45696923206.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4342758faa---dogekata.pdfIn PDF document text
    • https://equinox-e.com/upload/files/newedelaxixumuw.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/59159683953.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160789cdeef0ee---didebogavotonodenapebozo.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/zozawiko.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/zutoluzaridukevekuv.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a351dbd7a8c---39267745919.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/47727204687.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210616_011CE8E2CB3873A1.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_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 17144 bytes
SHA-256: fcfe7c65428d851dfd3259b4bf237b120142675540a50d759e6e32ef9cf1d6c7
font_02_sfnt_off000137b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B6 11008 bytes
SHA-256: 8ba6b99196ad4c7110519dedb34525e3b864c1dcca013db5079f327e474f389f

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