Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd5acdd17c6f23d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 03:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2938f8a67c92d6a692efa3e983e6ae35 SHA-1: e34f115d366b6afdcbe00557dbf0ca8b7da31229 SHA-256: bfd5acdd17c6f23dbe4771c54622b1c1672c7a0dda50bd08c75b58fe4c90472e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=dragon+ball+legends+download+android PDF link annotation
    • https://mk-sito.it/uploads/file/52259213486.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/tivuwemuvog.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27d988751---3936699125.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/lubanutako.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131362f57ed2---48268890160.pdfIn PDF document text
    • https://areicon.com/images/file/zotufowapawigon.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/nofen.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/poxisedapezagogop.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/wamawonubirinopitupamija.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/venaxiwuzojaku.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/4807953165.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/xowevamiluvoxix.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0v41fal146t9taafjsf4gbhu2v/32640886753.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/wunubida.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/runopixitamoso.pdfIn PDF document text
    • http://ecole.ru/text/images/file/21400297531.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109050006055601.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/betafodedelewo.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/rupulesowekuxawujanuwume.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/65541812005.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/50406497350.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/fudevisosazetiwa.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/78022389818.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/1383384067.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/35323161367.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_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 17332 bytes
SHA-256: e70eb380f1d7cea83884f9e03a2187639f3acb2d71202930359e2d21de74cfd8
font_01_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 10552 bytes
SHA-256: b6d44c3b741204c8bd4fe6020856e6968b9397487288c1485d4f95cd18f75303
font_02_sfnt_off00012a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1