Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a65c59d852a6e2b…

MALICIOUS

PDF

113.6 KB Created: 2021-07-24 12:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b82047a6760ff7ce7715ab1b749e2d34 SHA-1: a4aecbe2c386f0128ca28bc14a3f26ec6c364a5f SHA-256: 1a65c59d852a6e2b5f4da79ca5d7fded57a490d3476f77d75f2fd09d754c390e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084df0ac4635---gamerufixurelamubezizojo.pdf In PDF document text
    • https://eternalbliss.net/file/rikiribenitomajed.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/dutoj.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/fuluv.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/51876094695.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e1b7c221---bararepegevexaniwitebod.pdfIn PDF document text
    • https://ewt.cz/res/file/60176920151.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/17028324264.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/wifinumi.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/wizepunimig.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bd2744d83917293231b81206672b95cd/57294264661.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/d31hs3lsgs1t6ccfq3t86a73gr/kegodabomupidurod.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/04f695bc0e9d57dcbaad8560ef8bab92/xupem.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790ce2b8a39---15304748111.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/kaxodu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cfffa7595e0---37774871865.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f49476362596dc2758349b509aa66348/71651426196.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ab8fae4921234724197420f9b22ddf8a/89439704430.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4ba95172fef95784a5f4ce13ede66e49/80446743759.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccee8ef2f6a---74278895850.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jn69aqb8bfgee338g2onf46tqr/fowidedoranirejuxulo.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096979c8035b---68677245270.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/61510297919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=attack+on+titan+season+2+ep+5+eng+sub+facebookPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12518 7348 bytes
SHA-256: ba4c945ffc8337e78f5a09bfd3b8fd967d50bc07c7bd926e43e0ac2e0225bd54
font_01_sfnt_off00013e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1F 18788 bytes
SHA-256: d9d9726c5fe6efe8f7963003a2a5bbc62db8ff71658acd5513b9ed9ed1469b42
font_02_sfnt_off00016fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FAD 11076 bytes
SHA-256: 953d549f8f89be373dd734a163e1cffe8475051d6b86bb5cbb4c4d3784ebe0b8
font_03_sfnt_off00018994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18994 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_04_sfnt_off00019f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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