Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29dcabfe79f07f4…

MALICIOUS

PDF

116.4 KB Created: 2021-09-04 09:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba0092ea3a0192af6510bb641c93320f SHA-1: bd1c3a736891410b0ff7b04d687d6beacacd882c SHA-256: d29dcabfe79f07f4233f3903e7dc9626abd030bdc3d49fbce0ed787aab0183d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, indicating a likely phishing or malware distribution scheme. The file's structure and URL patterns suggest it is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=wiser+getting+beyond+groupthink+pdf PDF link annotation
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/93100d3a2dd4155869457cbb7dba2717/59991204783.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/18440308202.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/002e0dc46c829d1429785363ec0729a3/xuvokalus.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a7588abf9---18496039234.pdfIn PDF document text
    • http://dsagco.com/Upload/file/neridarigoxupuxaka.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/segatifizavasewapada.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f62b8936---gaxafutugiluzepelosam.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/91249927939.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/f548bs524hari6utuijl63qjd9/xidutomozuketuzejupovu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f7301d941---xudutixefi.pdfIn PDF document text
    • http://4bx.pl/public/file/repilimubabav.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cebb7284eee2e2734abff7c44a00a62c/89701737695.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160987f3b4b71b---waledufuzelopopape.pdfIn PDF document text
    • http://mobitransjogja.com/files/82411883129.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b66ca3a17b---roligejumopifanuru.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/56532ce85922b2508f7dde6cd736ca18/jazepujuvuwasuzudabusa.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5763b6926---13773092339.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f9cda4396a---vojumomidefobosafidasaziw.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/liruwegemijowunimila.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070406861f3c---22702338567.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/16e296c6251eab28ef50e379e20ed85c/25628875017.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/31/file/20210731_005417_130.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c66b18f3ee2---1207767024.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_off00015f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001772d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1772D 19700 bytes
SHA-256: acf84f63cff01ba457f76994c8b7e9e965f0f527a0d9fb0d928ea6ecba28164c
font_02_sfnt_off0001aac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAC1 11008 bytes
SHA-256: 532224de915ae8527356de4d998c1005460100c0ae84f15adb6bd81b3394cedb

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