Malicious PDF — malware analysis report

Static analysis result for SHA-256 591ea43a1976f599…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 13:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 20ac41ae01ff5b8b6e7549d617ad1847 SHA-1: 3b68e0a6bed4c166a5f806330cb15e7f5dc6acd6 SHA-256: 591ea43a1976f599888a7a6321cfac0f43866d225ecd378b80ab671859b4a2d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=funcion+y+estructura+del+tejido+muscular+pdf PDF link annotation
    • http://bkmarine.net/ckfinder/userfiles/files/1625889503.pdfIn PDF document text
    • http://lulanjina.net/upload/files/vafisam.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/wonirof.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/19209343496.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/827ddf38e2bff36e414430f8fc8fb921/74495940515.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/32960093328.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/badufilise.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/tixutazapa.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608594941ac9c---98915922692.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/de139b44ed177935b8cdbdd04e7392ce/dizumatixejutazekunuvijak.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/36586072322.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/71806027262.pdfIn PDF document text
    • http://servmed.net/userfiles/file/bunijuvek.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74b5cfc36---zadinajenevuvawupaxepulo.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ee0ace563675ec28998beac0f14ded5b/40318711091.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/favogox.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/tejabogugudozip.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/kekerigudeverizozirimab.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/1702222622.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/49dks6e9rooc5prbkret6l6b9h/83294336053.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/divag.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/14917991228.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/wesatalutekamejonif.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/ludife.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD310 11104 bytes
SHA-256: 33ed9d6aa8f14d48f0f6328e44dfcca0ac8609810c696e9f39e3a49c555bc7a4
font_02_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 17012 bytes
SHA-256: 3bdaae10605321d44710b1b8b2c63e602b8ce9ffcfc54f81f2bde9cb2d312523

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