Malicious PDF — malware analysis report

Static analysis result for SHA-256 241e1715b5bc49f9…

MALICIOUS

PDF

74.9 KB Created: 2021-09-12 02:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17bcc6f9c97f09288022a4923fbec629 SHA-1: 00538b9fe17623b7360e12a9228297358150e73f SHA-256: 241e1715b5bc49f93b67f96446541886630594b21650050564f1960cf0c3ca0a
216 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. Heuristics indicate it functions as a link farm and employs a social engineering lure to trick users into installing browser extensions or updates. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest it is designed to lead the user to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://olsztyntransportmedyczny.pl/userfiles/file/piluwak.pdf In PDF document text
    • http://energo-winstal.pl/userfiles/file/67955399113.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/gutonuni.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/fepiwapetunosin.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/gesaboto.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613349310a55d---15391902711.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133033a09c4b---lajizosabapumapali.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/57087679345.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f39db65ff---bumil.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/xowavanadederuzu.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/simuw.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/dapekudomisagonilexamip.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/gojejuxuzawamu.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/jokajikadizozuso.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/71694366242.pdfIn PDF document text
    • https://777mto.info/contents/files/83790439768.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/i4r9rhr316ijcv71jp5lo7lij0/51609809500.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e02ea608ad82c1c4e1420c6bce795baa/xibikul.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/wotefape.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/17323945115.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/lezokib.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/96722614746.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/28002948282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=send+iphone+contacts+to+androidPDF 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_off0000c337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC337 16676 bytes
SHA-256: f88a3c3661f69405b340a4addf4c4216a81c61ff90e295f147e264ff2a170e8a
font_01_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 10640 bytes
SHA-256: 51b8d07b67f0ca416cb3816c12c16a622d47d40fa71e59ef2f5e9c4e8a23353e
font_02_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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