Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad40d5c235f9707…

MALICIOUS

PDF

93.4 KB Created: 2021-06-27 02:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21a5debef160ec1e38a5599e9f86a1bf SHA-1: 3ab5335b4232c7232e79b7e42e1c9ee1e68c752c SHA-256: 5ad40d5c235f97076e02068645dbe40eeeebeb566138f22024ba0060d6a8d5f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure, possibly exploiting PDF vulnerabilities or relying on social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=website+that+answers+any+math+problem PDF link annotation
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/68e18fb42204010edf2c31627f60d702/7709831747.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/zarobaletufazezozewijatug.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/q48knq2c0hmhbft6cf3fe6hknl/lulavuxanav.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210512054658.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/88f140a737085dbef5cb446f50deae7c/letetezubokurelepuj.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/tabozimejaniwi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085f10e3be83---vesinisenoluxepoj.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/rewuw.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/1cbfcdbtgge0oooqui9db30es1/duvadiz.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/doripid.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160733b2b4c7f7---pidikoxavepe.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5926c14fc5---mewolatimilegin.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/35709089789.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a03321887cb---ginija.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/utc05ln37v3fas7vhvid0skjnt/wusomapetasodulorobegib.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/moded.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/pitalosapib.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/64295735951.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/029qe99tqu7lavgng7dr18lq95/8543953497.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/maminoxamixonodimubizufit.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12052 17784 bytes
SHA-256: 367a52473a1426f556b6c310a5f470afd31a7b3c3e3aed60e116195c4858f3d1
font_03_sfnt_off00014f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0D 10852 bytes
SHA-256: 2d2b59a25b3e5208f5f0954c5ba925fe69c95e36830c28a841694f8bab5f3b23

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