Malicious PDF — malware analysis report

Static analysis result for SHA-256 c010d4beee029012…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 05:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9bc5e062f942c4704327b1b9764558df SHA-1: bbc8ae59b99396586843bb6e08377c76522b773b SHA-256: c010d4beee029012fd65e20c8432efe2a5e6a455ad869dcd66122c3e9a338039
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, specifically targeting form upload functionalities. These links likely lead to further malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1aaec676fa---45473061643.pdf In PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/30687643431.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a78a0bf606---jigadu.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/74521856587.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/32651696094.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a8484f0b1a5f8682d6db49a8cbb29856/64313874415.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2417d9732---najaka.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75d66a6a2e---lojov.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d18a440b43---6217609612.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/giwufawerolisaze.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/rojis.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/vibumimusetep.pdfIn PDF document text
    • https://hojoairport.com/images/file/91936476969.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/goxobunapamoxaw.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608409155735f---silib.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/98294310661.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d51927bac40---rifezezesetubedepakotone.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/21974739915.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/65703843975.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/rurixad.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/r0o7tosed0pvuulhfhm6kjm9t8/larosodoxiketow.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/navusakaverujebulupoboz.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a01c1cd351b---vavojukotikidunoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=particle+theory+of+matter+definitionPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/26d973bd75e9330466e1d625d044b546/99820407540.pdfIn PDF document text
    • 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_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 17216 bytes
SHA-256: 66c252de6e9c11d36c5675fc728929b5cf7986f369f819da5e015a0fb2692d69
font_01_sfnt_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 10688 bytes
SHA-256: 86f3d998971bdcd60c6b4ba244a1293caa9700d6f52bc21d33eecf99e9763c10

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