Malicious PDF — malware analysis report

Static analysis result for SHA-256 7786e166f80651eb…

MALICIOUS

PDF

83.8 KB Created: 2021-07-28 08:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84cc9f2c905abe78796c5a8e31bdda29 SHA-1: bc0cdf8d204890ea67255f60bc7ebcb66a64ae97 SHA-256: 7786e166f80651ebcca1b97336ee5daf8339097fd105892d416084dbfc2e2a8c
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous links pointing to compromised CMS uploads and disposable hosting, combined with a visual download button lure, suggests a phishing or malware distribution scheme. The document's structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://riolospettacoli.it/filesUploads/file/gakawo.pdf
    • http://miroslaws.com/ckfinder/userfiles/files/13243950527.pdf
    • https://jetaime-shop.com/files/muxudarepupemafiku.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/1189eb9ok56o2s36ctaebqbuil/24437762392.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/9c4fdaa7509ecaaa68fff190d5aaad09/pupazaxof.pdf
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/d7d4f86de2209669d3c79ba38757b123/zogikorudi.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/20967a427197f51d41d6aec4cfcde4eb/zadoruba.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d0c187a17---nuvobejinabomabaja.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8hebhur4svrmjr2ec66dm9qt43/likiwene.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/26117402180.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/49714402863.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ea5d0af1c1540f0302365e47e9c20ad0/radoguw.pdf
    • http://nutronicltd.com/userfiles/file/wulivisusurojomijafewoli.pdf
    • http://flirdining.com/uploads/files/60113400488.pdf
    • https://moscowfashion.net/content/xuploadimages/file/kinutupetojavosivijezazu.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4217b41212---26246010252.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/3daa575b9ac351703dc0b5b479cf14b7/5896462838.pdf
    • http://alibabashipping.com/userfiles/file/74918726656.pdf
    • http://griesvoegwerken.nl/UserFiles/file/87409068932.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/02bacd3ff3c100b384811cfc7e5f5309/sutajinokijunafobidup.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d78e20730---24646810680.pdf
    • http://sakuragiramenandsushi.com/uploads/files/puxunibuwajo.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4eaa26b571c3342ecf0a46d39bd4ba73/53852075214.pdf
    • https://samngaimarble.com/html_upload/file/wesezixokivizegoku.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=synaptics+touchpad+driver+windows+10+32+bit+toshiba+satellite
    • https://mediaget.com/userfiles/files/jufigewelugaliko.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e193.bin
fc59e90f3497cebf39617e3be354eb58fbe9f9b613f7caa976164bc4ecfc5f93
pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 16756 bytes
font_01_sfnt_off00010d6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 16792 bytes
font_02_sfnt_off00012583.bin
1a23a9328c4f23302d9704ce446b7ef9b3fc1aa768e19e3ffe4a636c39d53c43
pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 11656 bytes