Malicious PDF — malware analysis report

Static analysis result for SHA-256 755c81fe4772dacc…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 22:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 43c07e9bd948c74212aac95d19c2d539 SHA-1: 52e989b7736f195d102f1c9e3c9e2f804e4a3d19 SHA-256: 755c81fe4772daccd0a8882ad065a00aece8743057495c6155984c0834128ddf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=interactive+physiology+2.0+nervous+system+the+resting+membrane+potential+worksheet PDF link annotation
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ln6fcou7aki12k9bv9m5mj6jme/30561105877.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/gapavizavu.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/34673213822.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/pekifizobuwi.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/ecaf81d09ab4ca1258484bdbb0a4aef1/60942326643.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/a0b2f4dc30b7d4791241dcb9c528410d/26468652281.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/witemosomesuro.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/75922474807.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/59795467518.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/figotiwomaroropumasupo.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/77564710633.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/e56f60d602b2c8973596b993d6d85892/negolino.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e158602bf3df41a066396c7a51870810/dogobom.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/silugajelexamajob.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c9c10a076b665d7cf2c9476ed7622623/darukevunoxoxojali.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16111df5bd8551---logopodewiregukolotano.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e5b77fd5bfd2a2ea86ff815155dbed98/13647201572.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/48029086717.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924afc8ce93---78770208600.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/64552986739.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/4559663768.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/42602048949.pdfIn PDF document text
    • http://ledins.lv/cms/file/wewopemebol.pdfIn PDF document text
    • 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_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 17012 bytes
SHA-256: 40ac851a8ec380f3ed035c6e3848c16eb9552cbb6108bafdfbea0f1fc4baa4c7
font_01_sfnt_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 11680 bytes
SHA-256: 14b67bd511b50f616222a7f9d584e99a258c2502ae7b612bdd55b928162ed225

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