Malicious PDF — malware analysis report

Static analysis result for SHA-256 5421fc503cfcd6dc…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 20:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cefe65e1e3011d1e79f034ef163152a1 SHA-1: b922a4cc2811f9c0927f67e93a193fade92c153b SHA-256: 5421fc503cfcd6dc8b5034b23a44c69d83ab4d922155d35fbdee827e2c5e30d0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, which is often used to download and execute additional malicious payloads. The document body heuristics indicate a lure related to invoices or payments, suggesting a phishing attempt. Multiple URLs point to compromised WordPress sites and disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/795c61c027e27f619eceb796b59e9e66/11502627746.pdf In PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xukekuz.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210809090821.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/fazakiverasato.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/41655508588.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/manopuzopibokijujosavejen.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3c0f432cdca16a6b587f4eee8fe5aacf/20920435174.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a64201f20b8321be462c51941ccfb7f5/33003659718.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160845a6ea57c1---gopabupumipibevefivo.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01ba4ddfb9---618219901.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/gozoxewerubavekerij.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/pukudajunesozivosi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a354795ccf9---60608433181.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/62520941994.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/94488601655.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/pakizokumulufisujam.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/86491505454.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e7c2fddf---33156872352.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/28db764b2c18116a3852ff629a0352d7/zizez.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/71141999856.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/vagulunalarigase.pdfIn PDF document text
    • http://fedime.org/imagenes/54137267630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=accounts+payable+ledger+pdfPDF 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_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 16436 bytes
SHA-256: 8b931e1a591335823a633b0f4eff7e70b25c060af26454a3b0b247f64fa89851
font_02_sfnt_off00011a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6D 11036 bytes
SHA-256: 7960f306d7c083b95fff1fe8fb4d7cd75011d59fc153f5a88c6f8d1d8601ac40

Open this report in the interactive analyzer, or submit your own file for analysis.