Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83c522c3302b9f5…

MALICIOUS

PDF

69.0 KB Created: 2021-09-20 14:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46b1fc45a8e0f4fd72f2fb1cf6cee8d5 SHA-1: 42599e4db8dfa3f79fbb444031ce1124d1bc8191 SHA-256: a83c522c3302b9f5a140cc304f1a2d21651807d0ad767cd8d6e1850a033c7ed0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, suggesting a visual deception tactic. The document embeds numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://jl-vacuum.com/upload/files/wotomarakalagetiwota.pdf In PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/geruwijidaf.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/g0lnmd9c7mm1b3coub3h8do6l0/deweg.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447d5e8dd87---40149144792.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/tibogani.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6ea95921a04e04e01136f8bc006380ea/guwuwatavufimorukameput.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/97204194854.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/lusatinav.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/26959239895.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/xovemirijug.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/77987713730.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/95319260202.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/gidigigamufa.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/18741143818.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/80226725929.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109140402549523.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/wibaxeges.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/81784946016.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/ruguvidajinozujudobuko.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/83777815806.pdfIn PDF document text
    • http://pk.mo/userfiles/file/62709406446.pdfIn PDF document text
    • http://actinq.nl/upload/file/winudoxola.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/sidovos.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/30643044676.pdfIn PDF document text
    • https://yodobashi-church.com/zajifutixedi.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/98709762055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+simpsons+hit+and+run+android+downloadPDF 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_off0000b1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F4 10808 bytes
SHA-256: c56ae142bf30501141e95ff2e71d3377720cbf711225d5a6bd510f77e2aa4ef5
font_02_sfnt_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 14140 bytes
SHA-256: 54db6566f01f00b9df1ac899fc8a3950287668c057e26da77550b4eb25c7a367

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