Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f90ed2e41a4aeff…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 15:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41ee2337cade24506e3b92b20a9a5b49 SHA-1: 2cf8a9a45c138079bb0149fda6657491628560c0 SHA-256: 2f90ed2e41a4aeff6744e37a1cf0020323e0e4fda6f0a6d2daba7c4daa4eeeef
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://huntic.ru/uplcv?utm_term=spring+boot+2+tutorial PDF link annotation
    • https://labelmarket.pl/data/file/pujaterev.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/zutakuripujefegisuxip.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/36366857424.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4828c86d733dbe3ed921abd1dbc061ab/wenefilewala.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/89691914490.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b9e18501bbf84194b6e5540a2c400900/razep.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/e290484916958c2bc6979aa03c838a19/xulefitamikoganoga.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/aa1773bf2d0f3fbf6b5ccaaed814d082/48737421259.pdfIn PDF document text
    • https://ka-base.no/images_content/file/xurusotef.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/pimavezuvexanebemuduluna.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ok1g0f3ft9n2l9trs4rqm4uidc/12449156158.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/hi4hrevdnvecnc4f7dt5es50n3/jirexidisulufaf.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610349d56c241---31922099880.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/47522467661.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/wegulijek.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c7113a54f3e65542c3e6764d811178e5/fafovubizexanijidogozu.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/86699855886.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608155bb80831---gelasojowababolenaluket.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/dinazivi.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/veketolizesalulese.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/tilapo.pdfIn PDF document text
    • http://sun-eko.eu/files/file/zizete.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_off0000c6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 10560 bytes
SHA-256: 128e981899492f1925126dd4d58aa5f6ee46d2c809e590602990306c54e62ad3
font_02_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 17708 bytes
SHA-256: 63eff1770564d20a5352931d1047b9605f80130a8657bf993994b2605ba7dd41

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