Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d79f022dfa5d42…

MALICIOUS

PDF

93.0 KB Created: 2021-09-11 23:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c6428d240b8f8da0b4781bb83e94547c SHA-1: e6f813947a7418dffa259b1878cc8746ef79becc SHA-256: 05d79f022dfa5d42db0066d584e6d1a3068ee23fc314a5e6f3a1688bddb5608c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.edmcenter.xyz/ckfinder/userfiles/files/31217342264.pdf In PDF document text
    • http://landia-print.com/pdir/file/naliwakojalagunuxasomesan.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3a5dd653---mexatun.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74f566881---topapel.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/99053623195.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109100615236604.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/femakakaf.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/gogozut.pdfIn PDF document text
    • http://philipsphotographystudio.com/savujemukekudafogaj.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/09/doguvuzefobiduwuxumi.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/diniwaxopojofudo.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/zupejenojozexeguji.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/40772337396.pdfIn PDF document text
    • http://radekslodkiewicz.pl/files/file/vawigexerepovet.pdfIn PDF document text
    • http://tiquital.com/documentos/file/momovofenefobus.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/36864920888.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/83676882817.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/22766892058.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/gokig.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/75109260864.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/vogukilexemanoderitavaz.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/vupusewesipozedidezekexer.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/bcf0e3a06fa6c49649dae4e55d949b9b/tupewutevojapixalewaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hide+app+for+android+without+rootPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_01_sfnt_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 17756 bytes
SHA-256: b3ee3e9f10b527cd99c2b06d362456a73e4afa9c8fc4ec733d9d510ff60522de
font_02_sfnt_off000135a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBA 10560 bytes
SHA-256: f234cf960b49bb788eb62409daead3e09a71931c45c458b60ce7f4964feefb96

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