Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9633bc2ea1eacd…

MALICIOUS

PDF

104.7 KB Created: 2021-07-31 23:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36cda348ddb28353d37dc74821c1a000 SHA-1: bcd7ff948f8778a5ea391451a5f411330eac8876 SHA-256: 1c9633bc2ea1eacdcfc9b0ff71a979313693d86f70f8085f2a9f7ada6737e44d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and ML classifiers, and exhibits characteristics of a phishing lure. It contains multiple links pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to trick users into downloading further malicious content. The presence of embedded URLs and the PDF structure indicate a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://aarogyamedico.com/userfiles/file/62466929532.pdf In PDF document text
    • https://baxsporthorses.nl/userfiles/file/kevuzimugovokamefuro.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f6d2286873f81f93c565e4e99a54bbac/37762104832.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ff182cf91---14478947012.pdfIn PDF document text
    • http://ducnhua.com/upload/files/7807943629.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/gurubilofux.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/28c3a62dc3e599a96fa01ef61d0c4738/kumotatejexipozifabe.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b3f3ecc0441a2945fe5f439da33a6442/votesemalunusojoxod.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905b49a2735---tewiji.pdfPDF link annotation
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4ee6d246582b281120775a114d815a15/24428149789.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/155518c31cc0904df4a5e1d07b015a08/munibunamubibitofisev.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b551c8d9b64---fenumozamoderejif.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/8975702126.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac09cd5c240---75247842847.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c0a8f57c7d2510b8ddbdeffb8d7a8c15/37383888119.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/suvij.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b094371f096---86625791267.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f2b7afe5565de32d52e0ff4ffd6631fb/ladom.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/182aa55a1b58296a834fc9b74a211832/kafidelelarimovemasiles.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e29de67608---puwarufad.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b6ebc3dba---97310958601.pdfIn PDF document text
    • http://soles2walk.cz/data/file/39472143723.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/342089657.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/48078264077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=solucionario+matematicas+2+bachillerato+codigo+bru%C3%B1oPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14065 22132 bytes
SHA-256: e8fb2ab3cfe6eecbc02778e9590329f8ed40580b7696f6318507375fb0ac0c42
font_02_sfnt_off0001774d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1774D 11456 bytes
SHA-256: 0195ba6dbd5dd97aa4e193a9a15e6aeb43df0676a43635299a0705148792a1cd

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