Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67f017bed09fa0b…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 04:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67a660f946e07bdce010c5e00a7c64fe SHA-1: 12a79c587c3c5fe0cd951975ed5b404402a22287 SHA-256: b67f017bed09fa0bdd4490b0f3c1a8d3ad11f56a57b6741aa5c23d1cbadc1a69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for redirection or payload delivery.

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 https://synerhu.ru/uplcv?utm_term=how+do+i+remove+the+pin+lock+on+my+phone PDF link annotation
    • https://alaqart.atelierleuthold.ch/userfiles/files/82480624969.pdfIn PDF document text
    • http://methese.com/upload/files/nipap.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///23148204502.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/bopisokokedovuwuferufex.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613f933741e9e---18619575537.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/pirugivelewuxel.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ec1a03bb93462025063b9a5ec50140c1/7490604638.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/61113400708.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/mixezavunajutixapedakino.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/84120558392.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/livisotusuzefupimomo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613da22d51bf8---zikekut.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/podijudavudadoligadoke.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/jodusopabixelosid.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/xuvaluzaxagovoxudewaxem.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/julezaxo.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/mibojo.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/jesojojomozidi.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/zofuferoz.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/kanakejinusakone.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c7e3c259a---vagibenona.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/winigobaba.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/35315819930.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630471482.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909083230.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_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 17832 bytes
SHA-256: 585b9a020b82401c8b7fb2bd5199e42fb2f8fb6d6627923447ddba744bed64c3
font_02_sfnt_off00012c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C46 10796 bytes
SHA-256: 527f723f553cbd70a8940642ed613eff1949cfdf9ea858853239f7897b496840

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