Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c0a95ad03623e9…

MALICIOUS

PDF

85.8 KB Created: 2021-07-16 11:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3b20014b17092a840774933d545e6d0 SHA-1: 54adaace05e33d5b315291a24aa30e48cd1cecb2 SHA-256: 19c0a95ad03623e9efaff3608c884504944f5e54534324663f1a45a4c5a6cf0e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://wawa757.com/uploads/files/muzosidukoxuxa.pdf In PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866a5307cd3---12149155045.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/49eff673334a9244670262d26eb11844/82695504346.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874cd478ca3---bobitu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d646c34e8a2---5308052532.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/kofojujid.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8624e4c574---dubageronanijokevigej.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/68s201s718m42m8igo41hui9il/lower.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f276e30f95---tibufuwabevo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/vozexafuzidemuzadeboxadob.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/j0dtrukjqbl03o963vtliq3fto/11570630646.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210715_6CDC12089F8C4255.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/3545239048.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/xafixaweze.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/40e306c5a60768e1183f9a6d69a72fd3/63458924014.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608567fb91c25---96964417919.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/31639097228.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f647852ce---19700279316.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/38562711597.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ef54451f781f95499465744f6effe341/zoleru.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/373839e1adbb45311535e6f4e7ebc802/6520687055.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/tofumuwef.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/moponaxi.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/mekawilipejulufuwupeke.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/609d567a778030992f8511e0bbeb82e3/68810854548.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/bugituzeroluxumepesuwura.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d95c4577e55---22626785655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=seafood+gumbo+with+crab+legsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 17940 bytes
SHA-256: e919e21f01937e14865e8c65b74f1be7a9fdac47b6c5218467aafa1931c9281a
font_02_sfnt_off00012e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E01 11220 bytes
SHA-256: 3e29abd124c97310bc2235730d870c77855a31bdf8d9f0c861fd563c73ba22a0