Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacfc99faa0547a4…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 23:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42b9a003ffef7e5f18bb0ddeff818ddc SHA-1: 537b4329c8962ebf691b7c9f403af46997972b9c SHA-256: dacfc99faa0547a476f51830c1587904cfe7b5767793330223735e7752348452
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=mod+candy+crush+saga+unlimited+gold PDF link annotation
    • http://pogologistics.com/ckfinder/userfiles/files/vuxazanepopixoze.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/65341202777.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/mupemufexolulafa.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/xotafofavaliza.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/jawafipafoduvo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1cb4a1379---1135191909.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/12269616207.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/judosajarixemabubisenoj.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/31744251180.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/pisatijo.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/gikitazuje.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/limezafuworuboxijot.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/larifozeburupabofobo.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/40330963264.pdfIn PDF document text
    • https://norservis.info/files/files/63302515582.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da368d88a5---23703647175.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/82352540372.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/47524294730.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/mopaxelab.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/47707626833.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137896f5284d---75744684783.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/zosil.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613cefea352fe---zufep.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/51483304696.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_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 17636 bytes
SHA-256: 1c31705363d12ecfac7646a9625e3cbd845325766400d3f4ea1fa033610872d8
font_01_sfnt_off00010fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC1 11024 bytes
SHA-256: 7b9621eb6f9de86d191f08de8fce39539a25a63a9da9f3ec592d3b09f679264f
font_02_sfnt_off00012901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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