Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7c561966fa2cd7…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 15:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42900c4bf93d7be85666bab4715052d2 SHA-1: 3fa3e37386c69026bc5f658049a647c1f45c0304 SHA-256: dd7c561966fa2cd773d983fe12bfd4e006f76ee488eef59112d06cceb4609677
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and link farm heuristics confirms this is not a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161206ce295c3f---biwaruzazopazedufolenise.pdf In PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609484ad1cf3f---titexadezerid.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/dcf67874d905f69d718225e1fe214505/gowebemetefemefadug.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611488a735e66---kenufobexamozunoxumatot.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5511532a48---mujexifomumiwurelunab.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/podaneteworibunowir.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/0955b1d04103ad67a7580fc3d6460b97/60456525450.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/71752895598.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7525c1e831---gidufexulowufere.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c363418d355---81120997330.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/megavazexenine.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607521b4dabe5---burarikotelin.pdfIn PDF document text
    • http://runo34.ru/attachments/file/14641898636.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/40373052064.pdfIn PDF document text
    • https://xistenze.com/files/files/bofomubotugezavuno.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fd18986ea8963c9157040ad0548a927d/begurebameneba.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/73669169214.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1d48d5b5---17231002214.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/te5ms88q75814npk9dlq2a48vt/venawadidoxexu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3ead585a3b588fbb2bbb909ecf646cdc/63336836596.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/44175443600.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05fe462b66---silegavijafeloniki.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/79009565700.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/mopifi.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/jt138sru9opea1g952nap8f3j0/donujubaxewado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=advanced+options+trading+strategies+pdfPDF 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_off0000c6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 17284 bytes
SHA-256: cf1d7aaa9e2678c5e8e0019452bde4f3c2fd7b96e1161ce9e92209b995ce9fde
font_01_sfnt_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 10796 bytes
SHA-256: 90628740765e9df0e151a336ee14a349b9a9eb8be8a0a2a85716286199c7ed3e
font_02_sfnt_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1