Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26c2b9e3900ae55…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 22:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d68c8868b0eacac021375e6ad7c79a0 SHA-1: cccc7c1b07013da052cf96f0857bd6a8af5363eb SHA-256: c26c2b9e3900ae551ccb16a630794fbcbf23c9c0efa6c5deff51330b2a28cb89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this tactic, aiming to obscure the true destination. The presence of external URI links further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=harry+potter+and+cursed+child+pdf+download
    • http://celyroknaterase.sk/editor_uploads/system/files/pimopunupiwajubedijemu.pdf
    • https://people11people.com/uploads/File/78283685901.pdf
    • http://alt-1c.ru/userfiles/file/60842214116.pdf
    • https://cplastik.cz/data/cms/file/11856883851.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608effcb92d8f---36782538833.pdf
    • https://airtelco.com/data/users/_/email/files/44114593986.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/fekosozevawo.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff8379f2ca---vebesirolagubuxu.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/xixapojigokipeges.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9b90a86f---kojenek.pdf
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/vusufimenijefaledepu.pdf
    • https://capecoralliving.com/media/file/33213043633.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210528100425.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4cbefbb167f17d507a37ae5867bca060/valulusogurajawafopenafu.pdf
    • https://alternatifhirdavat.com/upload/ckfinder/files/42053143339.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/7f479ea05371ea2ff7f891880583db6a/21114077236.pdf
    • http://kco.su/userfiles/file/14240344721.pdf
    • http://yesilderecine.com/admin/editor_resim/file/delesu.pdf
    • https://bselink.com/userfiles/file/dufufutetun.pdf
    • https://faprosid.com/file/mugilaguvenulobotimib.pdf
    • http://kapelski.pl/userfiles/file/96746088667.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mlqs0o99l5shlrkhqr3g5fgafl/17009037117.pdf
    • http://olgapolyakova.com/files/files/kogebifenatepudil.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b459b2bdbff---fetuzelalujexusetodu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec67.bin
be91297ac1bc3a6acac7cd69d1a474bd72bec4cc80423cf7fa5ba43b2bb225ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 11008 bytes
font_01_sfnt_off000105ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 16792 bytes
font_02_sfnt_off00011e01.bin
e998f5caf4e001d0a4ead97ae8f3a2ef81b330a4bce380f3aafb277a74f12289
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E01 17160 bytes