Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1dcb92824fc8e7…

MALICIOUS

PDF

84.4 KB Created: 2021-10-11 11:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2f48566deb9c2932fc363c2a22bcdcd2 SHA-1: 51c877d4f392aabc7d1890f4eafe9f6c75384c9f SHA-256: 8b1dcb92824fc8e7ad19070059f95c0c14ebea85f2419d823303f13c889efb76
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=student+exploration+rna+and+protein+synthesis+gizmo+answer+key PDF link annotation
    • http://gmei.lt/ckfinder/userfiles/files/geromoweruximulozine.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///74922494092.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/cec05eeac3a59f473a23d810db0987b7/lusud.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/28942854969.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/61533036901.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/65257442836.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d69973146d86725197a6935683ec2d4d/71222982088.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef5f03e0fc---tevejaluvob.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/niwedoxipafemojaxa.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/31742310413.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/49806561796.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/baxokefibos.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/wegudifotofusezovomu.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/fopidamipiz.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/26196633093.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/sojipovobafevaboxikiv.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/tukomubejunizesik.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/xedobimevavasipugiterifat.pdfIn PDF document text
    • http://hy-sf.com/admin/upimg/file///3094964210.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/lojarupexovimo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e40d24626---67459764563.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/mimutofetali.pdfIn PDF document text
    • http://irollee.com/userfiles/file/66064088250.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/95388001542.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_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 17824 bytes
SHA-256: 690571161ee7f790a414b74d440d3441151390e33d1fd67119e9438d9c6474c7
font_01_sfnt_off0001101b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101B 11468 bytes
SHA-256: 8cf7ee795f82e10247688cdaf33ffd823ec43c263e60282e96a5a9d037c4a71e
font_02_sfnt_off00012af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1