Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4028cfbcc15e5d…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 20:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5400fb94eec057e42dd213d7fcb84be3 SHA-1: d72f6f72d1ded2f6852c4146c5751b52437cbe43 SHA-256: ab4028cfbcc15e5d16e523b45e1d35cb6c916ea461ddb57ccda7a02200eb55f7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links to potentially compromised CMS upload directories reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c63f8764be67e21b14cd3c911688fce0/sukifefe.pdf In PDF document text
    • http://tiendanatacion.com/noticias/files/87989128114.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/sifigujowakewoj.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084246340738---rirenoberoruv.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/84514107989.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/fifozukonula.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/zadubusisefoju.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/keguvekojovumifenef.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/60636804588.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71fad26a33---xotipetunefedofofozet.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a06dca5b948---xosavozijuzukuzejevugo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d9854de04---fipamajezejatirazun.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/34975133281.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/19836713019.pdfIn PDF document text
    • https://egca.fr/userfiles/file/betof.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/12933630523.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/zuzugosimejexijusape.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/23462406925.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609264f196c9a---16348408892.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/41997673196.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a02449a4---16753234066.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b47b4f964d0---54431086989.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16105e24820394---64343964166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=vision+ias+current+affairs+magazine+may+2018+pdfPDF 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_off0000bb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB66 11664 bytes
SHA-256: f2deb9aebba60addd47e7c2849578e1629e6194b5d848a1ce4d69b353e2c635b
font_01_sfnt_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 16964 bytes
SHA-256: 689dc663275c111e19739eb3a278ed88796cee28f8d30e4f34f262c4339991dc
font_02_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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