Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd7454403be41bb…

MALICIOUS

PDF

86.4 KB Created: 2021-07-13 22:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c56b926f679fdbbbefc5dc7d0eb96726 SHA-1: 8f72f765aeac8d28867f5fe4ee1574a4ce19b342 SHA-256: 3dd7454403be41bb96eec0b106fcac34ab87f5240c2b7863809b6c7d2de4d963
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is designed to exploit vulnerabilities or trick users into visiting these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609068a5af460---29915677479.pdf In PDF document text
    • https://nmcs.ca/userfiles/files/75545587972.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/55eadf71be33050f785fd70108fe02d6/32795232886.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078030b8845f---nesinexexu.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/8005d871a6b4ccf4d264d1e39b93c0ca/19190987771.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/527f215578f208118316bc1576b3e119/51433223472.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/wilaga.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/zusesujufifomepesem.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/besasovitopedebez.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061018412070.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6c4c2e5a---32475914867.pdfIn PDF document text
    • http://biosite.ru/images/news/file/vupizubiratafuv.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/93807998874.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/kilugepupejokarivibeno.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/dolelixizizijup.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/798a0d4e71f833e6b73d6ab2fcef221e/veladosawenerimadi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e236fb5d0addd03ee6c29a7396e763cd/rugotomasuloluxopejivo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d1d94ebd4---1221510128.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/58f4942190b331725afb9a80051857eb/74834137355.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/851894482b8d9abf33fece03a255422c/niwozifelereweb.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/j1v9vof6mt3c3fu3nd3a6jjtht/muzitisubatazewipoj.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/59734705878.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/6398d57e81f0ad60aefed8a5c89a04dc/verapivilizis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=agricultural+land+values+by+countyPDF 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_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 17000 bytes
SHA-256: 4311677bb0aac55d6ecbfc87375f8c243a29096a9ade3910a2472305260ca643
font_01_sfnt_off00011921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11921 10944 bytes
SHA-256: 0441e21207e2444d9564a44b163aaf6babf0153a930e6779dd36fda816ee5230
font_02_sfnt_off0001327c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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