Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf3ae041ddf2ad5…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 20:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c34b84bebb5a5fc68df82d54bcf7add0 SHA-1: d0d7a4eb41f6cca07ccab987d2cf6d32bc9ae294 SHA-256: 6cf3ae041ddf2ad5b8265f2d2c8e8213f729597dd95386b0d75f11f6f6ba62a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of external URIs and link farm heuristics points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://laborke.ru/uplcv?utm_term=mod+apk+crash+bandicoot PDF link annotation
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/88adb65e22bf8d8cf3adde260884fd0c/296631496.pdfIn PDF document text
    • http://dakov.hu/_user/file/6924712587.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/zokamuxozujesunujuxepobe.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/6916220759.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161454a23eea7d---79989275208.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/tilokagatasaxexofuvetesop.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/32538036259.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/gawefefij.pdfIn PDF document text
    • http://exima.kr/userData/board/file/lumemizikitetujuges.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/47420711721.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3ac5692f2---ralatipemuwegewu.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/sololinizawemaguzup.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16136fcc4b128c---kuzuzupibifazuwopirali.pdfIn PDF document text
    • http://wami.cc/data/files/sujotozu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161427e8f49571---wupunilanarejena.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/41462855675.pdfIn PDF document text
    • http://domplus.su/userfiles/files/57159347914.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/29333616979.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16147eef7ae0b4---92756988911.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/53854112980.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6147f5dbbc787.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/8f0c84d901c2b44e631cb61385c8843f/33394767523.pdfIn PDF document text
    • https://penal-garazh.ru/files/zolijasefutumisixuv.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/92087634858.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/14927921347.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_off0000b57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57A 15340 bytes
SHA-256: f8dbf334d1cec64d4268bebd8ecef50f98151b2a8031f6c253d126a1bf00f768
font_01_sfnt_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 10660 bytes
SHA-256: 62251086bd490fe2c1c5f606fad3a5d00970afe8ace70c92f00a9a9eb0201ca8
font_02_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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