Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfe7e04af38b16e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-20 12:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6617e4516f952fb53ba1b15446d64bcd SHA-1: 1f795888be0776d44d2bfc166a18ca57421d2940 SHA-256: 2dfe7e04af38b16ea68f3019f1c8b3e931f560f3407ad35765a278ecef5d7a6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=traffic+rider+mod+unlimited PDF link annotation
    • http://fazendasaojudastadeu.net/fotosempresa/files/nuwazugukotanatad.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/9547160828.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/88431722356.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/6666765456.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/losapalaluwugax.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/14583935314.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613267fcd98f7---mitifu.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/20566542692.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/biwirupusus.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wuzovatud.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/xovijolozulesowategulopu.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/9303733300.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/19190568523.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/34256969305.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/45867899189.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ab31a5857---47142877628.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/wavamibigifalori.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/848805215.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/97898882338.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///bizixasurufobisuwazo.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/30879672075.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613045d1c58c8---noposi.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/68272728100.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/12984134396.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_off0000c097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC097 10532 bytes
SHA-256: efce2927c4b00b37cdf8eb3c416cf4a970edd7e32710b9db23459ff16cfd97c7
font_01_sfnt_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 17048 bytes
SHA-256: 71ac8a398e4a1993313f33a9b1f5dda9bec30958e9966f7c2e0ef1b713b2350f