Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2161753bb186e20…

MALICIOUS

PDF

85.5 KB Created: 2021-07-13 05:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 707d3d022f66343d65a6cef43ee5ed1f SHA-1: 92bda7f1fc150f9320d1351ecdc17bdba6b97a14 SHA-256: f2161753bb186e200fb0e20b6ec69bad134b3bee5be2042fe42c59feb736e7a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://alfavs.eu/userfiles/file/sawunikisonadejarisu.pdf In PDF document text
    • https://iamtimeshare.com/userfiles/file/17554534780.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/04dc62ab02537d692559b8645b4ff9cd/gigoma.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://apsons.eu/files/file/loret.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/91964267794.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc50e82ef---pokimawopure.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/dokomozekiwewifavudariro.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/20266833684.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095a1a6626c4---72454039469.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/raxoxo.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/mefidukunepen.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eefbae7f5---padukenuzewexarodam.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/gikekurusupewajavijon.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/2hp55et4shdsvkrotv2p53qvmj/jadobaxizotato.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/2b3419345c7ce783f587d5b44fbb684f/repel.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160836f1f81ad9---153234526.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce6bc10ccc---45692904867.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/8288476860.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/510aa9ff74597afb0da50d4efc70e884/35092057742.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5a53880d1f656fe150624aec33352acc/faponibigizivugofuje.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/vagax.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e008d101459d593a3d6956d22a2107bc/zederi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b57rosdm9ld7ptb45890l4u5um/suxubabotenulemigepus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+add+gif+on+powerpointPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 17236 bytes
SHA-256: e41bffafc6e0a7fd624aa96962a39ae87abf2f39fd6f0ecf52d491bb632507b8
font_01_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 10536 bytes
SHA-256: 0fbcd2002b988c18dea48ce1085b567d78ca20693b925c164d0cbdc9ebeef27f
font_02_sfnt_off000130e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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