Malicious PDF — malware analysis report

Static analysis result for SHA-256 6862a1ccaad7f0ff…

MALICIOUS

PDF

95.8 KB Created: 2021-07-04 05:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3e5d567f0502b768b678edb820e516ef SHA-1: 88e2e2ac4393f52ae0ab55f3262631b8918e72d9 SHA-256: 6862a1ccaad7f0ff5f9dcd7e13d22b86e5faf536c86cb648f37f489a933f7baf
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of multiple external links and the heuristic firings confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/be53314848bf24d1f7b23b6dc1c4738a/97314852639.pdf In PDF document text
    • http://archpiudue.com/userfiles/files/berakazagepuweka.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/33598074260c1d70167dd3.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/95102476919.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16088587246829---tuduvovi.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5c9011b1d0be6fd5d68c82f26cafe830/37804165739.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/75433446386.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/34476557213.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/06b77cf65a1cfb62ef88179275852d48/96675521862.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/nikakegalalufaxamabuletud.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a470bc426ca---16550964413.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/migirodow.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/p32sd5arifgbfv45fa62gb8gfm/23104457736.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606e646f043c1---42352702511.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0f4665abe0b3926e9d17390d55042f40/98783846716.pdfIn PDF document text
    • http://snsi.jp/image/news_file/3141505668.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//benalexotafixowimameru.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1aac9ea61---kimajedodo.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/afd5dba88bac428ec3d291a9984be6cf/42966179433.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10bd96872d---83551524964.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608351191d6d7---91463496259.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/lexasituvitavitil.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/97038053067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=anger+secondary+emotion+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 17808 bytes
SHA-256: 40e911a357ccfca02d3d86764373fd68c0a5ae7d708b27addfa29d96890defbb
font_02_sfnt_off00012aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA5 11012 bytes
SHA-256: fc55ba61f34df69aeee074b68f57740fd1f06dd7f578ccb32f5d0251314b526c
font_03_sfnt_off0001441b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441B 17396 bytes
SHA-256: a99639b5615980cb3301860dcb618c0e9269c0afc9e3b55af95f425c82140e2b

Open this report in the interactive analyzer, or submit your own file for analysis.