Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8ba1ed6cead365…

MALICIOUS

PDF

78.7 KB Created: 2021-08-21 15:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: edc5d9114488289d2722b43714f1b2df SHA-1: 5064948be0a13a8943f5829f39d5aa8de869ea50 SHA-256: 1f8ba1ed6cead36552dbc07826b33c0bbbd267ebe7c666785e3ed7d24e3a9086
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=middle+school+the+worst+years+of+my+life+cast+and+crew PDF link annotation
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/90ae2bc8ba93d4745e70fec1f4d6eac1/68750500935.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/80234357532.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/cp5v8a3hvo349qc7rrr3dt19j7/kifetuwadupe.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/abcetadkis2meeec1nmmoom1j7/74160619485.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/31407762427.pdfIn PDF document text
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/95077637550.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/8aipbijqvb51h4lc4r2g0li2i2/nebijekexozupupilobabaji.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/52ucthq65brlp39lduaae5i95u/wobejoboju.pdfIn PDF document text
    • https://limsurempat.com/contents//files/vuvetazegopazul.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/noweke.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/nhmhqjj8e7enibjne02ntpfd38/zaxokisexunevegakijiw.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f35e287cbe0---metonotekujabuk.pdfIn PDF document text
    • http://playpenghu.com/userfiles/file/77623311646.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2714bd8b09---wanineku.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e18871d4705---pesilo.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/21259856394.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/24235323050.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/nedil.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/4rscppbnlsmli486noomv78ied/41587440086.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/b86sh8etf8bgj9r574i2ojhv9h/79079675069.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/80816424049.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/f0mbkv8utunul13g7op96u6at1/kidewux.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/pesusalugixulowe.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_off0000cfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA9 16796 bytes
SHA-256: 6b8b31a6ab51430ededc0cc4136232612e91e513e4df82f701da72032f67a903
font_01_sfnt_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 10932 bytes
SHA-256: efdc6035a04a3d51d23558b22cabd24ff7716f1437c1e1605a20006b6d88cad9
font_02_sfnt_off00011448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1