Malicious PDF — malware analysis report

Static analysis result for SHA-256 af36695550a73fca…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 01:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a33d37c7f4ffc872be43227223632a5 SHA-1: 3a06784ecf75279e2d1b8733375dfe06df3389b4 SHA-256: af36695550a73fca9e7f1c1fa5f4e2d30308f7990e76a4ebba1113fc54deb1e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing campaigns. No scripts were extracted, but the presence of many URLs points to a spearphishing attachment as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=zerodha+varsity+module+4+pdf PDF link annotation
    • http://big-blue-bus.com/pics/fotos/1/file/24488071227.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608214c200e0b---zifoxasuxotok.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb144ae0db---76272643853.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/javaz.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/fuzipigagokaxavujebapaf.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/degezijibenilofirur.pdfIn PDF document text
    • https://motacademy.it/file/jarititozabaxivamijagima.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7b1cdb7a943a15f23f227c6eff22b3ab/ziregaleku.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a346e05b8f665a1c440d1a8d8adab647/6142016732.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160908114b8396---62523018155.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/pupidozugiwa.pdfIn PDF document text
    • https://tavio.ru/files/file/19355084652.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b440f66752f4e7b3ed43e388ea847dcb/46726383406.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/628abf683cb1d18479ddcd34c4acbd84/xuneliror.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/55ebf79fdbf0cb2dec973c328573a099/36518757363.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gkgtj054ma3jb7uc2p3o0im257/38674640057.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/26412361116.pdfIn PDF document text
    • https://gannat-ltd.com/userfiles/file/benip.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160762230afdf1---10129846972.pdfIn PDF document text
    • https://network-italia.com/file/duzajexi.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/44627939575.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/78855715193.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/jinukojakuju.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/jefujesovid.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/429150f586396dc5db879ee0119df3fd/sijujamonuxozoluforepona.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_off0000c92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92B 16828 bytes
SHA-256: 941b292889a99ed66e2b7b9828c902fdd6af67a3a5558fa95a19deb229db09d3
font_01_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 10980 bytes
SHA-256: fc0ee759b766fe4ebc10aa3fb5967727f5f48a5297c2a1ef7020240f71420b11
font_02_sfnt_off00010da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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