Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fc98ebd15636bc…

MALICIOUS

PDF

99.7 KB Created: 2021-08-09 20:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a29e14250a28ef0e62784b7f8111070 SHA-1: cea37aed3cafdb89ed69faf4b0a50d113777e8cf SHA-256: d9fc98ebd15636bc1f865eb0d9261d414ccc7d1008be18c169a38e629a6ae109
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs and link farm heuristics strongly suggest an attempt to lure users to malicious sites.

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://archism.ru/uplcv?utm_term=redondillas+de+sor+juana+in%C3%A9s+de+la+cruz+hombres+necios PDF link annotation
    • http://dhf-china.com/d/files/20470284287.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/60655784761.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/r6h22rm1t1lr1t9hesj817v6iq/76022497485.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/nemaguvupoku.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qr6f8ak0ca65vs9pftts6afp42/sanuwura.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/npo7264ual84m4ongb4v2lreo0/nibibon.pdfIn PDF document text
    • https://akemi.ro/hirek/file/77539519192.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/68307884853.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/19209313756.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/468rr6otpoub70k2204miuukt7/88501074636.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6ad6251d2517e24a86eebf3ed3377c57/17497205296.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/reratexetezemoromoke.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/51857843845.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/e4b2f8d133882bd1d936678289c51ceb/gebiwubonobedafiwima.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/87104065309.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc34d4cedb---xegoxe.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/depelorigawadaro.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/20544213896.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/47c1be34af3ee2a1a457096206373e9e/39658616231.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/77953473616.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9317a6681eafb670912d6091b575765a/26737432314.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/daxosazalorasuganubabosu.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/6c9379ae4b4cf6eed050c178ba579d7a/tupewigikifelekewivepox.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_off00011e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3A 11168 bytes
SHA-256: 55e0240796b7172ea4e6e071ff4969a0a81d4f7c0dc02ce6fb6490613d649459
font_01_sfnt_off000137c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C5 17808 bytes
SHA-256: 65c0f75432c70ff1b0c47df27b6024d14781795d074d1b9a6161b32da637d2fd
font_02_sfnt_off000164fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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