Malicious PDF — malware analysis report

Static analysis result for SHA-256 1807fff22df54187…

MALICIOUS

PDF

83.3 KB Created: 2021-10-05 05:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b4f4d12c3487d4065ee24205876a7001 SHA-1: 65f39a056455cce36676796c9508da0e643e4e6a SHA-256: 1807fff22df541876bd3257cfe56275897d8384eac4ac78e970ea9597c80bb77
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external malicious sites. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a lure for phishing or malware distribution.

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 https://garglob.ru/uplcv?utm_term=what+will+be+the+most+effective+means+of+increasing+the+dissolving+rate+of+sugar+in+water PDF link annotation
    • https://implantsdentairesdesmoulins.com/upload/editor/file/88633920026.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/jabemu.pdfIn PDF document text
    • http://ketex.com/trcgp/ckfinder/userfiles/files/wevoguvepo.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/pobobafufowubulotofa.pdfIn PDF document text
    • https://scalper.ir/data/files/file/35690329549.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615a81bab14e2---69165304572.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/46869678346.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/65021520984.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/34452065304.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/rijuz.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/48a7a6a48396b621671b9ef8a513eca8/57251097775.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/lojixetokemupasapuzever.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/63212820908.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed97a3c218---pukikejabiwugakazido.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/43307977909.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161464be170d3b---86162332917.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/lidebegizimukon.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/vexeseje.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/gufifumuduwi.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/88701324976.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/jirebado.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/raxusezezaxasezasufe.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/77986297243.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_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 11308 bytes
SHA-256: 86d42a896d764b2156aa2d670f233769c17b91bcfc0bc3c5a3ef6adb11c3509c
font_02_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 19120 bytes
SHA-256: 1e0d578f04affaefe5ac5a5d3b426858f5da42e6b83458b1dd1277d005854ef2

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