Malicious PDF — malware analysis report

Static analysis result for SHA-256 df94dfaf3b459bce…

MALICIOUS

PDF

69.7 KB Created: 2021-06-25 00:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: caab2706f72212ead92a99c41e68d60f SHA-1: a9b41140c9b81e4fd4590e90bb7358d6912cd352 SHA-256: df94dfaf3b459bce1e3fb158bcf6651e848d18b2f162fffd9d5d2dd911eee707
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links, likely to distribute phishing content or malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=friends+till+the+end+pdf PDF link annotation
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/p9jtroh49geqjtpft9h40toioj/56229992870.pdfIn PDF document text
    • http://wirheiraten.de/images/file/53694125597.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d727fbb086---zawulemodupakesusob.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/disalobawoposubi.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/mofeges.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b599151c388---55603402055.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/37573479478.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160718654f0218---75533376068.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b247ade4110---1966243454.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50ee2e92a---30630365569.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/jiselomuzozasuxibo.pdfIn PDF document text
    • http://apcmagon.com/userfiles/24053818614.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/rebeburidulijetalof.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/xavixukumib.pdfIn PDF document text
    • https://airbays.com/userfiles/file/55361503349.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160797e1509022---sezumabodum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 4872 bytes
SHA-256: 3d09f2490258cef41b7125a87d9b930c77c192bee3b49572a4bdfe0b5eee51a8
font_01_sfnt_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 11932 bytes
SHA-256: c41ffc94b718f551ed34bcbf4d7782d0968eb13a139f72251bcca0a07a65a2f4

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