Malicious PDF — malware analysis report

Static analysis result for SHA-256 382b1c73744f36ff…

MALICIOUS

PDF

128.3 KB Created: 2021-07-06 20:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 93b08105e8aa09198644ff6d32b3a098 SHA-1: 75ff6fa65397806897f6cee3682d01ea5695426c SHA-256: 382b1c73744f36ff16de314b5d84ea963fb6c763951bc7261500083c255b72f0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://skncn.com/u/files/jalemafigezimirowuxin.pdf In PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dce5622d4a5---12344975614.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/63ot23fbvkem7kj9oh2gj5bkl5/zasewuxokojuvetemajidi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2bf9e8e52---wominej.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/10107339717.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/90745426770.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b340569bf82---pukagobonopuxu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aded826e5---2290071085.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/10364001364.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/gizunu.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210602115110.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/nevuzetuf.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094207e63a21---66198750938.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/14863742791.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccaa013eb---povulotidobopej.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/6a48b5b4c993481c1da25ab755fc3691/52560217488.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/cd23345edde1e5ce597bf4b8ccf69cf2/xupage.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9471eb43e---42531016117.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/e9d7aeaa8715616a9ba48f9502aba4d8/nitijesanolekalobovumetag.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/pilug.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1591b1f048---96097024540.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/63802211731.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/454f7e911ad55b5bf288961405a1390c/55058326985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cod+4+remastered+trophy+guidePDF link annotation
    • 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_off00017bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BD1 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off00019117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19117 11012 bytes
SHA-256: c17181ff3980dd32c1a3200727dc13ac79e072e8086f292ea27abefdfaec3ce4
font_02_sfnt_off0001aa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA94 17756 bytes
SHA-256: 3b53183de2a8abdf488275fef79c075ab6055f608597ee4b3e83f60431db65f0
font_03_sfnt_off0001d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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