Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c9b2bd881f38ce…

MALICIOUS

PDF

95.9 KB Created: 2021-08-09 22:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 535beebf075ca1d40a79816899f4947c SHA-1: e5a3e097dee6f7ed80a742db30b074d5e0f79ec2 SHA-256: a9c9b2bd881f38ce60f457d5772a8e002c5d42210603d0aca48f174330532622
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://nomylo.ru/uplcv?utm_term=preparation+of+benzoic+acid+from+benzaldehyde+mechanism PDF link annotation
    • http://www.ecostroyservis.ru/File/54952933475.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b4bc5480b---36096248707.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/26401440246.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/saxesejigogisol.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/sazukixofoxefawuj.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a30399f1118---89424501324.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/68163783586.pdfIn PDF document text
    • http://artospace.com/pics/file/fivolipikalidafuvobajem.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/759952fa1f51dd5d873cd03672ca6ab1/kakarikunowenotigerixufal.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/zalopipov.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/46734582113.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c562294e0a---66664499954.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210611085443992.pdfIn PDF document text
    • https://akemi.ro/hirek/file/zulikagas.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tt0o2q1q2h03i7uo21qg4sr490/vodezafelenefavidimaja.pdfIn PDF document text
    • http://519pf.com/userfiles/files/70934409801.pdfIn PDF document text
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/bofexukuj.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607950a5495a0---35184471918.pdfIn PDF document text
    • https://dm288.rs/slicice/file/33465495376.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/190911328251.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16094c41a3350d---57500832725.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/afff70a8f548b366baff416aecb6a60a/zokutakapadipebetipoj.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/vibubobokifudodu.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/buboji.pdfIn PDF document text
    • https://agatanorek.com/files/file/jefod.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_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 11200 bytes
SHA-256: 6c861c92dd43c573b0b3608ce7f858bf59b44a8e31d022860feb3094c7a27102
font_01_sfnt_off000129fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 17096 bytes
SHA-256: 069f3ba678a0e4f31d86f58f3f730944f2fc060f1c56e6187fd76c5443186664
font_02_sfnt_off00015692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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