Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ebbff21453b835…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 11:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 613255c196f54ba4208a4557f3d2fb9b SHA-1: 2071e8bd472249070c840010226b11e631016fc7 SHA-256: 05ebbff21453b835630f05797daa996ef73c0e36aa317d6caf092a1cebfcfbc6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gabinetortodontyczny.eu/userfiles/file/tigivekamur.pdf In PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/59598942024.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86884078602.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/62938926913.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/15619539276.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613932120e4e3---vumigivotigadukalaturuxu.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/35386795353.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/9018922034.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/letinu.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/53480715229.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/xitagawebugulowoxepefe.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/39862838373.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f26348496274964f6ead25ad465ff4fb/wosazomo.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/4703078467.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/zifedurerewogelubewon.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/75346510560.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/g3q2ih7t8vk2tb2gg6mdmpu1m7/ritidexowetovezudego.pdfIn PDF document text
    • https://kuepancong.com/contents/files/83976186742.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d4cf1dcef---84717491198.pdfIn PDF document text
    • http://medica-brno.com/files/90097326775.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430a9ab5561---92781329455.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/35176761150.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/76236010196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=twice+toward+justice+pdfPDF 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_off0000d734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 17104 bytes
SHA-256: a8327f98cdd74e721d252330478ae65ab683b8af2c99f717b43a2aacca425910
font_01_sfnt_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 10740 bytes
SHA-256: 748b25dd5ae0d3cbdac4ca9281d64d327201a4a25763fb51e28f9565f1b52dbd
font_02_sfnt_off00011c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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