Malicious PDF — malware analysis report

Static analysis result for SHA-256 897472846987d546…

MALICIOUS

PDF

83.7 KB Created: 2021-07-16 05:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b63f18520848464b0e4b8d331c0e3a50 SHA-1: ffd8e02608f467273c4de7312ccfe02c9f1e143b SHA-256: 897472846987d546c6a8a043d44ab78b101145404a2e540282a29f8446f9ffff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links to external websites, many hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=meaning+of+roomier PDF link annotation
    • http://abimobiliare.pl/pliki/File/99759239711.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/dufazetoxukasovetijura.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/a4s7uckq0f10jujtfsb6nqrmb4/faxiguvewitujilisig.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/6ec92fb23331cabe8150818d4ae93108/silusadexosesufakak.pdfIn PDF document text
    • http://asvpp.fr/pdf/dovaronewawu.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///49462587335.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/6336782025.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/xekasovumiwiparuwedinukex.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160de93d221592---60780869940.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/vogudeka.pdfIn PDF document text
    • http://wawa757.com/uploads/files/lerixomomajafijagumoziri.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/cff4aae2c1d367d399d824f108ab67a4/dubedopovarazum.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ac2771a95---dumelakotevetapi.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210619_9E9C7F1A70ACF981.pdfIn PDF document text
    • http://iwaandccareunion.com/clients/57137/File/selilitu.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/gdpb7c1gp76p9g3bod48cgo2nm/66982690391.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609029b085e79---razozupawizusamajozixo.pdfIn PDF document text
    • http://garderoba.sk/images/_file/727595848.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/zomanuxi.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/23701812200.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b822f43d6ab---74293391421.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/64064bb6eef2bed88d53d94f9041ef23/tirolemarejoko.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 19120 bytes
SHA-256: 64448d5f04c0d036ab2fa6c1dd807d6f6740513445062f05791649d5c658495c
font_02_sfnt_off0001115e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115E 16692 bytes
SHA-256: eafb2828387a6743d2d74aaa79a93b14757bbeb14555ca9ae097bec54c165d38
font_03_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 10240 bytes
SHA-256: 2b82693e84be41dcb0ae5877d8fef4e0bbbe27d34650032b0a5afe969e53e51c

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