Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc852cc983c8c2f5…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 02:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a5c0a62d1514ba73551fe6fb73db4a7 SHA-1: e8609454ae6010155adcddf10600522e566d921d SHA-256: cc852cc983c8c2f5a5ba4b9a7aadee1f91097e80f266ae2e2628439b1e231121
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by a machine learning classifier and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external websites, many of which appear to be compromised WordPress installations hosting PDF files, suggesting a link farm designed to distribute malware. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic indicate an attempt to trick the user into downloading further malicious content.

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.
  • 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://nomylo.ru/uplcv?utm_term=worksheet+accounting+excel PDF link annotation
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77e9b4bdea---13835773472.pdfIn PDF document text
    • http://rem-proekt.com/f/file/dokozas.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/tapazuruvavuregakol.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6eb4e11216e6af740e55c1d37c9f192c/tipuvuruvatuxagamatejot.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/bivozugolabelu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/sobgnli2t06rgt0d0k1933d71b/tozobewagomuja.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/nijorexofuvefunit.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c7cf7a44b78c1615684d19f5ffe81ffc/32454649496.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/91881127413.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c20968159e7---zuvotekiwuk.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/fadedunijodel.pdfIn PDF document text
    • https://buka.ru/sadm_files/962075882.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/gedusipifit.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5fc341bda5f6f81b1e52ea82e097b3e6/fiwemawobawemibetisidut.pdfIn PDF document text
    • https://people11people.com/uploads/File/2859275595.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7323d925---pekexedozemozad.pdfIn PDF document text
    • http://friulanapanini.com/images/file/64651966610.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/bisumo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f544bbde4a389e31dac9d5e21a0414a4/31862358392.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/388876dc2187a8548ab05449457e5a51/lanoritazevububigonanefo.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/lixowadabibowa.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///5117170648.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bdf978c02---pigubiloxoximamogada.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/guxuzazuvawirosozod.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_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 10796 bytes
SHA-256: 484c70d03edb7e52dd5d0436e90ac99df01c0b1ed7312a2daa93de94efa02392
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 18204 bytes
SHA-256: 054059c4179c74a7cdcb5144b12aa3efed786144bff66c6eca91536fee8c8922

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