Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ea4c683cdb8eba…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 16:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ffdf9d0497d0f6e79405a575d5d0152 SHA-1: 199f84c3fe59ec8af3e509012536edfb4b8f3db6 SHA-256: b0ea4c683cdb8eba3989c83fc423e4e18a0967d7bd32ab72632133e3d84e78a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=the+jungle+excerpt PDF link annotation
    • http://sbkf.org/files/files/neponusabovunepebisafa.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/56006370438.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/52455628471.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/muziraj.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/suvuviwot.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/59038000150.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/q55ie3dr8eii2svl52mqqhj0g7/rozavuvinepuribatidapama.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/sopanoxageb.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/mazetilo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa4e886b53---duvalubomuxatowen.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/66439927794.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/tekutakejebeb.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/dixonomomubopel.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7132d826---kudanosutuporadisalabab.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/28015023243.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7cc897a69a4e12a10629ec1f39292d1d/mexetaletemuzalakoda.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/75953149599.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16105f5f88a4af---kosevideberaf.pdfIn PDF document text
    • https://industriameccanica.it/file/15699832111.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/72789253210.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_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 16812 bytes
SHA-256: 786ddd7c14c5b1aab135438a70365d730eb67cd77dd51f1dcce14df68a9414f8
font_01_sfnt_off0001175c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 10404 bytes
SHA-256: e94aa6ee4ca2b58683a8c34451635ff752d770e6ee30786e8cac9ae82982b6fe
font_02_sfnt_off00012ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1