Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd576c1aafd7acff…

MALICIOUS

PDF

94.8 KB Created: 2021-09-05 04:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2a3e8ce6efbfdf74a7ae8b00bb7afdb SHA-1: 02019c0d66db6804f685f7241afca2b8ed674e16 SHA-256: cd576c1aafd7acff83937c3cd97901e16aaf53fd4acc674f23a97ff71e89f789
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://wastran.ru/uplcv?utm_term=advent+bible+study+pdf PDF link annotation
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zutiponufejarogededuv.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/022ffa539dbd1439fea06cc53a29a3c1/dozozanuzosazubesupeguxuk.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/57385805713.pdfIn PDF document text
    • http://partnercable.hu/files/webamalejorujiw.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/0aao6cveuhngeks5nl15dhhet0/legarobeveza.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/62634811001.pdfIn PDF document text
    • https://pindimana.in/uploads/file/mubiwilugexorurilazemoji.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/99148446195.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ffbdaa37dcb0232755fe2a10ac363c6c/barofidikizorarefisuni.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/gawutowajifefufipotije.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d5d7c2f90---59575076526.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe589fb2f---75589752832.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/20799151974.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d07548f1---23556614126.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a848206e530---41639413942.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/29815140388.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/91907792779.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/klo22ao8cjc86u9ec5ij3kdm87/17190070396.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/e7l2msjj0pt94q97s45rua4uij/zixazefadepipavulasekevuj.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/8592906482.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/20820235011.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c7358975007---69334524101.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210619_4271AE94851335AD.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d588c7b335ea09ed393b8bc4fc672d68/15799360815.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/ddd9549651c4232f83fe3194fc413283/sulewo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23db8dd1c---sobaxazape.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/vijidekiviwebifuporixu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 10512 bytes
SHA-256: 7677be022cee1b678d00ade4ace09203bbd8065712d6d199599e7bfc5e80087f
font_01_sfnt_off0001256d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 18460 bytes
SHA-256: 80c116cb61d130106b1b9c8af35e9da2dd857cdc10aa8200cceb925462359ae8
font_02_sfnt_off00015510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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