Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d0d2238549e386…

MALICIOUS

PDF

72.1 KB Created: 2021-09-19 02:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8519369a7d217f2c7d62a674a1563000 SHA-1: 7cd8fea8f07fa51899bc7338b91eddeead0f0bcb SHA-256: b7d0d2238549e3863cd82518a864227eb6136f5d1ecc5441086b9fd8e303b6e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. Heuristics suggest this is a phishing or malware distribution attempt, as evidenced by the ClamAV detection and ML classifier flagging it as malicious. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://quartierdete.fr/uploads/fckeditor/file/wilurugejida.pdf In PDF document text
    • http://talani.nl/userfiles/image/file/nesatajuzupofuxesegej.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/73636843101.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c8d035692cf83e88c7ea2143b5d04faf/rebemugur.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/busut.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/68235313868.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/towotomepabi.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/sitokoregozoperusoked.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/22369869833.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/mademenagaxo.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/97770537876.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/sapobuvejokuxizisexizi.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/solefiroku.pdfIn PDF document text
    • http://workontext.ru/media/file/43529499710.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/61775508465.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/76a1846c25f47f2b222fe8413926d551/9808403226.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3jmubp3uh226juv44mdsr9qdo5/wetabonegidafewa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614165c4b9f7a---guzatuluzevibi.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/fuwisi.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/gonewedutukusifebubo.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/novisesisikizugaji.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/pojom.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/nutivedijopen.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/39ec37b38c7fb675a7a50437b1ac5644/xonidevevuvem.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/69048923601.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/rijuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=define+k+means+clusteringPDF 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_off0000b8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A4 16132 bytes
SHA-256: 7c482dd493942a5bef5fb06cd0b2f7ee1734a007b4596d72ae2bca4f15f9c567
font_01_sfnt_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 10752 bytes
SHA-256: 2a4f0725a052f78c0e0c38f8c8f06f6b0a80e53f02200dea04deffc0c945e33a

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