Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55b40bfa1afb428…

MALICIOUS

PDF

170.4 KB Created: 2021-08-08 20:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ccd2fa8d1aa485822af2e58334fccdd2 SHA-1: e69233d1fc1c47be7b17ba1b361e584ba848a8cd SHA-256: f55b40bfa1afb42821cb51436e39e9a7277ccbcb14be15a65961824da0c79084
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://oniceh.ru/uplcv?utm_term=english+hood+a2+b1+workbook+cevaplar%C4%B1+pdf PDF link annotation
    • http://musorcentrum.hu/files/article/file/75493741111.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f2f33b781---13778342482.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/lebaropijumiv.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0be483fc1fb9a9c557e87b2e1dc2b1b2/mazonamutifivamudod.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/66460ee6628aba84ad7f460809f42308/76544215382.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/5nhpi6fqiebrmk6v8ch7qdeqc5/44577616954.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/lupisenora.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c908b7ea351---59473307859.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/31095224916.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/53uqrjrb0v8gebnajjddim0jnf/neninegogomukol.pdfIn PDF document text
    • http://wohntraumgmbh.at/tobigab.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/nirarejar.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/2799662386.pdfIn PDF document text
    • https://arerp.kr/data/file///72706088830.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/a09vc65nsauve8donc9882k7p3/77234365795.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/4ec917572cf915f14aee89a462bb7e1b/24542816487.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/9ev1ehqd5ga2nhorrgp2jhm6rm/bojik.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/23230884875.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/13524041472.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/likiminoduki.pdfIn PDF document text
    • https://amblamy.ee/upload/file/28589484306.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc98e615b8d---fefujenawafasekufuvufe.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd224bb533---zogoxorevu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa4828986---vitaxelogiromulo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a950bc2cb8---newixonewata.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_off0002312b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2312B 11388 bytes
SHA-256: cb33ec6d71a7ebab1b2a34d599fd5d60e265851af68b8518b43e6fb911a32b3e
font_01_sfnt_off00024b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B92 20740 bytes
SHA-256: 60f3c324819383fd10d943d69690538382bc7b6818b5f88a4f316e7330387952
font_02_sfnt_off0002800b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2800B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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