Malicious PDF — malware analysis report

Static analysis result for SHA-256 4728f023aa1c963f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 03:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d989a34133c52c0b828fc1779af662e0 SHA-1: 46a00c1d2990bfc41e16286a6ce165fe188cab8e SHA-256: 4728f023aa1c963fec44adaa450617c4c3b2c51d3372bfd08a529e97861000a6
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of multiple external links indicate an attempt to lead the user to a malicious site, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://mascotdd.com/file_media/file_image/file/vafipaninixi.pdf In PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/fatabumomalopikazu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/35u555vbffh9qn7gqmi2icj8tf/98179996546.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/36295f045db1b28005fc0695f24d70df/dewir.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcf28cb88d---99456316646.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/xonome.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gamunemewepebajupu.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/tisodapasuvasogafedul.pdfIn PDF document text
    • http://abpaluso.com/upload/file/vasulejakukof.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/33185504060f077257be1d.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/46352824645.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bede2398aa3---17892090436.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/3dfa4fb6d573e87a0cc8a14d69befc61/34446869043.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/81060849485.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/waget.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/fidaniguxenuvogu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f3771cb25---fosirawe.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c494956d115---75537031338.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/xenop.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202108250644571926.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jozifonadegogarule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ontologia+del+lenguaje+pdf+libroPDF 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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 17980 bytes
SHA-256: 89c230cbedf0eadd0a7184bcbf13705d7f842bc5311cad47cc687f54a2805283
font_02_sfnt_off00012266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 10900 bytes
SHA-256: 4953356d8dbdef2710913b4d431ade4e56c5e13aaa43fb909984d59db54261fc

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