Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e96ef75bf1bf206…

MALICIOUS

PDF

77.1 KB Created: 2021-08-23 10:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fdf7be9a943a6667558d718d32443de7 SHA-1: 14f76f6c27413752cd7c1f49a5dd88b987d685a4 SHA-256: 4e96ef75bf1bf206fb81db90a33a7f4745949d1159843a28cf923c585a2fa905
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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 http://duoctruongxuan.vn/userfiles/image/file/loxawenebewokejasipoje.pdf In PDF document text
    • http://ayurvedicclinic.org/userfiles/file/48987206865.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/wetigizi.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/60bdee3bba4db0e12b80a4f6ba78f268/87639784122.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/muxosujofineviduzixa.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/63f1bd2397d1683103947768114274f6/viwevuzinu.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/27470212153.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/jivododipusetaju.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/9ad3b2a79879b88c09083695cdc2bfc8/30151988480.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/tutulujisa.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094481247b9b---37319507327.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/puxazesudobizikego.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/82002192488.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5203f43658---muwikapova.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/vamalukodiradifujelusisaz.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/vkv5tda0oi7ioo41jahnpafcr6/nifadem.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/kebos.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/wilaposo.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2d66b6ecf---bazazovo.pdfIn PDF document text
    • https://aedwea.com/upload/foto/rexenibivawonabutotazod.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ac61db6c3d2dd2716682ed200031c11c/3371082250.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf10be086---rujaz.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/1684514022.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/saxisixupajofafalix.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/45c1303c4ffa68f9e242d0eb42030432/lakoxerejuzaviz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+enzymes+of+the+lysosome+function+toPDF link annotation
    • 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_off0000d3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 16084 bytes
SHA-256: 9146e50469623dabce8814d00934f58c8dc94dbd3873b08918dc330f5e96000b
font_01_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 10576 bytes
SHA-256: bd08115e5f583d9933c33047276e4ef962398fd80d3c7b9018af71af5804b34f
font_02_sfnt_off0001159f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1