Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3206f74781e3e5…

MALICIOUS

PDF

86.9 KB Created: 2021-09-20 22:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: babcc9a65569fa19ac932e11649cabf8 SHA-1: 806147d533a6aede0b66343eb7057f66d988aa2c SHA-256: ad3206f74781e3e528f98790685cdb0612e0b5c6859d5c1dd52ddb1261eaab32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is identified as a link farm, with several URLs pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=pokemon+tv+app+apk PDF link annotation
    • http://exima.kr/userData/board/file/30602697404.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/78311506980.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f9fa0a1ef4fc438435781bd070ed1b5b/nejoturidipuzugi.pdfIn PDF document text
    • http://fygl.net/uploads/file/101953379662.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/55674327181.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/51717986841.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/36165520512.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/kivaref.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/fokulegobozat.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/87612305488.pdfIn PDF document text
    • http://iphysiology.ru/upload/zerijo.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/duzokabeg.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/37900114314.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3ufr3487e7hskkgcbpb8f30844/kevovupuj.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/58572c9cc39da5d6cfb9e7437178a650/4694252917.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/jisulowurujubilixowog.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/tejamakezez.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/50408501441.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/20652284883.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/jogojupunipizen.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/50907423616.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/15250215877.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/burukapaxulafa.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/31839479384.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/51567932703.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_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 20136 bytes
SHA-256: fb998de591c8f4e6707a1aabcb7f19d84abb08442918e0ab139d066dca361857
font_01_sfnt_off00011d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001358b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358B 10168 bytes
SHA-256: 917332a24155b77e8dd392aa4fb940fe4f1c4e6a105f9aee3ac15ec915eaa32a

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