Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8b8151f655fcb0…

MALICIOUS

PDF

97.6 KB Created: 2021-09-04 21:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e72e90200da06ceea5b8b3acb1bec761 SHA-1: 456dcf5d89e19198911263ac75054b1bd3a819d5 SHA-256: 6f8b8151f655fcb0778615b3a2bc457e65def4a816f174f2a03bd2381151b3fa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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://fonnepal.org/userfiles/file/xodukuvosekonovuze.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/72561309601.pdf
    • http://kjphotocon.org/data/userfiles/files/5461058596.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa3f72e2d8---fanalofapatunezaxalipuwo.pdf
    • https://samoinstitute.mn/uploads/assets/file/99703408082.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d712d402e08---xumezawovomipejewazote.pdf
    • http://come2menorca.com/images/file/41614046484.pdf
    • https://www.tvmreza.tv/ckfinder/userfiles/files/mewije.pdf
    • https://kham.vn/userfiles/file/42408492839.pdf
    • https://termoformat.md/img/files/22725129642.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e52847a778d---673180647.pdf
    • https://akonis.ch/userfiles/files/funirevamiteki.pdf
    • http://nyett.hk/uploads/news/files/judoginebaxukarajatijimu.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/3843f4utjb5vocprvafmtt2962/77518248996.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210523030915.pdf
    • http://aldara-latinoamerica.com/userfiles/file/fuvemuwuw.pdf
    • http://rafaelstore.ru/upload/files/69774024028.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b92c7bd2875630f172c4b482faa556d9/wogova.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773401a2a86---76407122356.pdf
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/33814481880.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853473019c6---wodagud.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a8d57fe899878ccdfcb0ffef3a728596/nuvemigatof.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6a8d7c93f---20214032727.pdf
    • https://jmtours.co/aym_image/files/42359490148.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3509e05890.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=espiritismo+livros+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5b.bin
2ef4e83d21b0a8ef9a4f3664617223f78b030bf2158a6d91d95b128945db9a25
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 10312 bytes
font_01_sfnt_off00010596.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 16792 bytes
font_02_sfnt_off00011da7.bin
8511ae5743bdfff97fedf2b54cbe138fb8779d7498958e101d711cbde4c09cc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA7 16304 bytes
font_03_sfnt_off000133df.bin
fcccfbb7e4a93c2cc3af03f3f7f8e96fb1dc61644eb3a06c801677d922989e48
pdf-font-stream PDF embedded font (sfnt) at offset 0x133DF 2060 bytes
font_04_sfnt_off00013d46.bin
5e9f5a0b0190322bae295061faa0863a3f139ee703b9f217aa0f3d4462e9abff
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D46 22796 bytes