Malicious PDF — malware analysis report

Static analysis result for SHA-256 b024f795290edc3f…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 02:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4bd7bcc232071e010c3903e50327fdb SHA-1: 6d51efc65823c5baf1b4af957d58c2960b6e810c SHA-256: b024f795290edc3f044d3d6990f4b766e49ab3149ea53e3ccd316f1e076bc9a5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns align with common techniques for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://synerhu.ru/uplcv?utm_term=what+is+other+in+phone+storage+android PDF link annotation
    • http://hsi-international.com/ckfinder/userfiles/files/18247322962.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/xovusofolirojenuturav.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210920133057.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/pepegekaxus.pdfIn PDF document text
    • http://deforma.it/userfiles/files/87760796767.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314448228c1---47553796494.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/92691325095.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/tuxuvanalugotikowu.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/poduvumetexuxofufero.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/wejajiwodutalerekafife.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/zujixulotafudus.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/gujederupage.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7007fb67c1372fb7961a938649032ee9/86896759088.pdfIn PDF document text
    • http://grabnerestriche.at/87747326757.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/tejojajemaxapegana.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/61394618405.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/pizilekuposugobat.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/63862447548.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16149a1334a542---nagasexiwababijedogosa.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/jumafazuvixiletux.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/94519611846.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/25e80b54e24052e91932d53537d2de22/paxod.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/xonovevuvejikusuxif.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/gavufo.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/87352912313.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_off0000b0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CE 10616 bytes
SHA-256: 8da3d5ac892e8c135a6279d4ba02a34eae5f18d6037ce27617308f9e643a13fd
font_01_sfnt_off0000c8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DA 14424 bytes
SHA-256: e28b89996e707331f6134bf96d05a2bd7d1437b1c24c34df91dcaa5a77be0f82
font_02_sfnt_off0000ed0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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