Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fce85e517643ea7…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 05:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92b0cda5ba35c47f7b28c98f7d75fbd2 SHA-1: 12ddb50482239c05b30e9025e6fb0b2d1be32cfa SHA-256: 1fce85e517643ea762f9e1264319135208dab74181d3e3d47e7d908a244c3a25
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.yoko-ono.be/images/userfiles/file/rinetidata.pdf In PDF document text
    • http://contextuae.com/resimler/files/latadururizamiparivu.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/53191302398.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/60720690739.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/81623089720.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/43397558471.pdfIn PDF document text
    • http://acril.ru/ufiles/files/jiwavikose.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/7294249341.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/91700866021.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/9a30025f5b1885448fa95557605e6180/pojupowulaxuzoger.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/denovosetosekiduje.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/sakabivogifeme.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/lavegejasenebilepalufu.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/lilewow.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/5550327508.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/ludukepodupurubijuten.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/digedapafada.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/zizamurob.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/21936962590.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/67b1a8e5665f4f93ecdf7a559b9eb494/pirurowenetug.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210916_144303.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/nojuzolud.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/defitarakesufibevuj.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/81864197353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+app+profile+page+designPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381993cd724---77649089116.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_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 17868 bytes
SHA-256: e46ba6d77935de6b723107c225b9530ea42b3e27499be162246e22f89b78c9b5
font_01_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001356a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356A 10556 bytes
SHA-256: 3fd24e32103fe970e23184162b07fd55fd08fecc02f3ecf027f9f3affb0446e6