Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2575886b6880724…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 01:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9dc6e3c5dab149f033e5a54b6d5d2591 SHA-1: 67c957782837bbf2e02ef7eff677957ccaa886ad SHA-256: d2575886b68807247794a95e7e1d231f6714d47cc6e2cfcce07ff77236931e5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS uploads and disposable hosting. This structure suggests the document is designed to act as a link farm, likely to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://herbwaterthailand.com/userfiles/files/9872543158.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160865d983f911---nogotomibazegawata.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dc77b9b21---89435156106.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/musikugikufube.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/c32c5e4175963861cb17e334356c289c/44843100939.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/98345263374.pdfIn PDF document text
    • https://arerp.kr/data/file///pufakusaliw.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/jutuz.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210602_6394AF5CEE142F98.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/46358886157.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/jegibetobokitorigosime.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/levije.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/2399830842c4459bbd99207ec1cc08c9/98786932385.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912a0b2e8ac---nowafavevozel.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qf4s3bbqlfodr4m7h2croanab2/vojoredeboritiperune.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/229c1deeae98d0a91c618734f3e6f118/jopuzixaleri.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee42227b5cd---8788815664.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b693a79fd1b83b7ff402ca74431cabf9/benenala.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/14684014432.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/nidefuwow.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a84048417---xezages.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/66651129106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=short+comics+story+pdfPDF link annotation
    • 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_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 17284 bytes
SHA-256: 3b0bb69c8bd5ddd9da8ee3d5e2bf8f25fe3eccd039c3a287ca3f6cdaf07496e1
font_02_sfnt_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 10628 bytes
SHA-256: 70a8792e4378eea46bac5fdc396d5810f76971a326e178095eb0bd71b1797123

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