Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d1260b8d761493…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 18:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9fcbbdd599aae8783ddc2e3bfd5fe57e SHA-1: e21642b4c27843caf470abc8877a956cb05343f5 SHA-256: e3d1260b8d761493eb05f9700972d8391ff2d7e298063be060dbd5022f8e8c88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=hitman+sniper+android+free+download PDF link annotation
    • http://abwfinlay.com/uploads/files/repuzaboxoxo.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e429ba38cc86618000d69eed9abfdcd0/turenumakefunudu.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/pakelozunazasuked.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/57ugq3s1p48g0kepk5cpl1h4ua/zewixevudagimoditetab.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/tulitasiz.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/7a1897a575f5d8c3648d8120bb4c9c6d/zexalubadipug.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/96069746004.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/223083720e52c233207b10aed2c29503/wowaselasakizivebomule.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16137e874eb8de---wuvovadiwibuxogevomon.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/34164004680.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/8255907523.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/vidufikumadogena.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/4195095508.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae62b5015---84581717874.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/mumevopesegedeleg.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/20848581090.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/nekelelarimibapeli.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/4380072870.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/gugugaliwofol.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090700481570554.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/tetidaso.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/1998587985.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/bepolat.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/69898017521.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/segudojanatetiperugafuzo.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_off0000d3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 19272 bytes
SHA-256: 776469c6a6f1a7b12a83be4a619e14d53f288374b97cb99425d1805b4e627c23
font_01_sfnt_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 10736 bytes
SHA-256: 963bfa43af92cd8028e855e12de1f88049a9a385f63cfd0b4e70a19e06ea0263
font_02_sfnt_off00011e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1