Malicious PDF — malware analysis report

Static analysis result for SHA-256 45645f8730990a8a…

MALICIOUS

PDF

86.4 KB Created: 2021-07-01 15:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a16c89ba5efde16b27df70735bd3d5c2 SHA-1: 1d568b599a7adf93163a775ecf6c2944a5264cc7 SHA-256: 45645f8730990a8a82dcfd940fab9e8275d448281bc0324858e3187f4cc2258f
164 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 CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ghnservizi.com/file/pukubunu.pdf In PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734db75f229---sijiza.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bfb6e51e110---72744656456.pdfIn PDF document text
    • https://buka.ru/sadm_files/68710173090.pdfIn PDF document text
    • http://ludifrance.fr/userfiles/file/78491979675.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f0450076c---36039296257.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160733e793cb03---rinafibusirojavifaxiz.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085902c1ea5a---93323202906.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ffed2351a43f50691d64bc44848d1c6a/zusegexizuwam.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ac50838a---38324698292.pdfIn PDF document text
    • http://www.toptehnik.si/images/28812046002.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/45495d7e7c7dbf83944d540a14e03fae/26144671174.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/7028c29e65c19dc982381385d9d7594b/xizelupakinap.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b06fb0c16d7---kukivakanidezizuw.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfea02d78fa---dusukefuja.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725c659863c---31620481544.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/gkqj7vlk3ahh63k8u068h65pj7/92771178094.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4289b77725---ditadoleburezomejaluxul.pdfIn PDF document text
    • http://farashimirooz.com/files/gabuxeze.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/lasejaparopiva.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a9452a60---dunobeve.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-23/20210523155514269318.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8ad84b0910be09cf9c5e34e1ede6e1d8/bukudenifarusore.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/fejubotituditakudinijikep.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/bumete.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/vojenerabuniwulipifiguj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=draw+table+in+illustratorPDF 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_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 10428 bytes
SHA-256: 17e5761e62b7d82070b6a8c5297958051e2ade5defd661ba0578836e3c57f692
font_02_sfnt_off00012131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12131 16516 bytes
SHA-256: 2cf64f1be5482b6ede9a4d42d67970951cdf30f5952af1d5caaf9b9f59875d01

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