Malicious PDF — malware analysis report

Static analysis result for SHA-256 2baa4207ab43e923…

MALICIOUS

PDF

86.9 KB Created: 2021-07-04 06:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5291018f975de67ec8b8e05937336c1 SHA-1: 7c488925a0141b87e79b9f4407dc35deffcf8ac6 SHA-256: 2baa4207ab43e9235b09c047851adb57d779c310d6c9dcfef357113bb1134d82
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. Several heuristics indicate that these URLs point to compromised WordPress sites and raw IP addresses, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd2531d37c---63304760169.pdf PDF link annotation
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/51dec0e436863db74cf8327b709c7831/bekogonenov.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vilunurura.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0a6khm3barp12tok8q8ueifssm/mavepukubinibebiwo.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/70140192845.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/14655300144.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7124ee11161204cff34858be109df4f4/fexanusafimubinamufi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a4bcdb663eb9ade67d264d33272424be/69096464438.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/lofaf.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/17282419486.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/japonikivimanuga.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090e99e7b80f---56103254890.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/25b3d6cf21d3904f5d799accff1f5265/16574105808.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/7ba88fc201fda54469d8483521dc784a/donatoxibukasar.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/luredaneruvukinala.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b962360a994---6050892722.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/jafogi.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/zazoxisafopedozirife.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/fadimaki.pdfIn PDF document text
    • http://hylevel.net/Uploadfiles/files/65637220107.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/g5q0qb2aibd0ql1epbcl3a1v23/fazenaxaxe.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vopoguditesurafagadalag.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/10806889221.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/77393469922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+new+pdf+from+existing+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_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 11064 bytes
SHA-256: e1964a6fa7025fea2020ca77c91a4cc127d8080912150807b6947496a07ce557
font_01_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 18136 bytes
SHA-256: 8157120bc1541b21627781e47a73d6e0ba71594d448066911bcc4c269802230d
font_02_sfnt_off0001364f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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