Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1c6601ed0a5670…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 08:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2274ec014cb499a23082a898156c0d06 SHA-1: 46581aff6e9bee1b1ff47b4ddd146b080d1827cd SHA-256: 1d1c6601ed0a567056203e61a5bb0cbc331d8e9bc06bc3059dcaf5ce3c1be898
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to obscure the final destination and potentially track user engagement with the phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608299060949a---susiteza.pdf In PDF document text
    • http://sooclose.eu/upload/File/fexuvoku.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/zugisebimivolobizitede.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/pekoxifidesitamusezol.pdfIn PDF document text
    • http://chongros.com/userData/board/file/39142886658.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/88790104213.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/74981395020.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/gncvofaul70re8idfrshsor814/lokaxeboseg.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/26718450404.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812c148c73e---rejifijavemipikuzo.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52f631ec9a---36258951494.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/jukebosozeju.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/64161483269.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16109e8879916c---jojajelenipuxa.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/ninubidekumeremi.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/badunusumusedumesokon.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/33aa6ba410580f643e524901c7533619/29353829534.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4cee6acf478691b54421a7b95c058e65/tapinikefi.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/diwagu.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/kefubosib.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/42871125585.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608802913a581---vuvowogoniru.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/nebifaziwituwev.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/dimusazixo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c33fd2b276---bapegatibimemaxerokuruped.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788e379ea07---dukilanipazodor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=simple+carroll+diagrams+ks1+worksheetsPDF 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_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 16800 bytes
SHA-256: c4e9f4cd0293c0eb3d53cb3e9917dda654fd82ea625f00ac424e3f1d72137d50
font_01_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 11164 bytes
SHA-256: 785baa759f55814c6094c6a72d774436e6258e8e417e9deabc8a8be914d83f6f
font_02_sfnt_off00012214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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