Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b15ee02cdf3f3f…

MALICIOUS

PDF

69.4 KB Created: 2021-10-03 13:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b80a38e30803051efd60c47129551350 SHA-1: e58785ef0e8f0eb5b96b65cfb0b4e935f914db91 SHA-256: a3b15ee02cdf3f3f8fe057a422dd3af6093815307fb2e0440012a903bbff6d2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of external URIs and link farm indicators suggests an attempt to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=declare+array+size+in+java PDF link annotation
    • https://thenovgorodspaceship.andreirozen.com/images/files/tudeperekaritizedoni.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/zixubanerodiwaw.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/27504115.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/8500433343.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/p6oo3h217vtouji22l0flos1qa/93790054619.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16158547a95d0b---birakiwebomimijuxadop.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/63006860000.pdfIn PDF document text
    • http://pk.mo/userfiles/file/62179741381.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/38214306361.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16141c13919673---31262983977.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c44c5060b6---vetapuwepadovutufizabip.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/67874673002.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/loniligixusilevuxe.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155c71279136---jamobenazesavu.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/nipimem.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/36591537664.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fbb022bf48745f75c7949974a7db23b7/waradojekat.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/vurizovejama.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/50869885201.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210904065146.pdfIn PDF document text
    • https://paperland.bg/uploads/file/zojuva.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/3790790116.pdfIn PDF document text
    • https://combrooncom.com/contents/files/67880844701.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_off0000b241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA58 10376 bytes
SHA-256: 4c7d70e79d387bbe9142538008162a550f587991b2f7fbdf7809800c75c1e822
font_02_sfnt_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 15068 bytes
SHA-256: 494fe8b93b20701ff086c780c422056db80fc5f8d1eeadc8e4463ae49666af90

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