Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c023f2ea312090…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 15:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3aac3c54c51f5e07d03e8f9495bc5475 SHA-1: bea7c85f191ea54d660564ca65e872f08bdbff4a SHA-256: e4c023f2ea3120903930cb38089160aa1465f658841c1a7ac149c8b8e4bced21
204 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics and ML classifiers as malicious, including ClamAV detecting it as a phishing trojan. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a link farm on compromised CMS uploads indicates a tactic to obscure the true destination and leverage trusted domains for initial distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://kkagro.com/media/images/upload/file/jodamadipikawixutogax.pdf In PDF document text
    • https://superpart.com/files/kazojujabijadov.pdfIn PDF document text
    • http://edusfera.pl/upload/file/50069014484.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/tofegunibaretugulitelul.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/11026877305.pdfIn PDF document text
    • http://01host.ru/userfiles/files/zusasup.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98911529368.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/nipezinofirijujafugojevi.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///12005212558.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/41365524678.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/lipoxexokinovaru.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139596437efb---3187813005.pdfIn PDF document text
    • http://anindecor.pl/files/file/55354127515.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/koleboguki.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/21db16c80d45d3cf3f19bc739ed38e45/jofixinisex.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/jinujolujed.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b12761351159faccd65391e647bc7f60/tapiw.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/wibabub.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/jabedufusexelamesive.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/778909fb909c7e240784d7dd56f38dee/xenap.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/rolatekomifositabiwilosud.pdfIn PDF document text
    • http://kunbot.com/upload/files/41943522608.pdfIn PDF document text
    • https://toocapen.com/files/67196535985.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369a727ce54---monuruli.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/38199487726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=four+letter+f+wordsPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/fumagodudesaluvemoxuk.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_off0000d871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 17908 bytes
SHA-256: 39652b2cf63519e2cfc7d2bc1ce6f518ec6cefbc314db54e50c7420bb4440d7d
font_01_sfnt_off0001072e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 10152 bytes
SHA-256: a3222e33031e22e89c1a2d8f7ae14b7925b27ce9ba5b6b5f34bd0f65ca86fc57

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