Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd953dbc590fef4…

MALICIOUS

PDF

94.3 KB Created: 2021-09-12 21:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e05b1ca5d12130a26ccfcfab553dc86d SHA-1: 4411af5bf9ef4d4dcc26e419b7db03dc12258ab4 SHA-256: ffd953dbc590fef4a6fec831fd640dd71862ee6d573d911e098da9400f700333
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document that exhibits characteristics of a social engineering attack, specifically a 'ClickFix' variant, instructing the user to press Win+R or paste a command into a terminal. This technique is often used to bypass macro restrictions and execute malicious code. The document also contains numerous external URLs, some pointing to compromised WordPress sites, suggesting an attempt to host or distribute malicious content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://nomylo.ru/uplcv?utm_term=skype+video+upside+down+windows+10 PDF link annotation
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4103344724be9ac5c9aad11f76d9b5f7/42568599659.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/55771677274.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/14612682169.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/54117162973.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/lunizowosasoti.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/romisawaru.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/vatekoxalonokifojazuj.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1d14be02---65197233094.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/gibilisawiduk.pdfIn PDF document text
    • http://parentini.it/userfiles/files/gisorunoz.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/nivewapapedaliwozubarowa.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/50970738456.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/sufedivuzu.pdfIn PDF document text
    • https://campermagazine.tv/public/file/53830659779.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/86845515660.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/31602368706.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sikuliwivuvifexepofe.pdfIn PDF document text
    • http://csp.hu/editor_up/30323372793.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/zogufarowivivarikajojax.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/rofonomoserofex.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/309716285.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6aacdcf1bc36fb7a10c080dd82518019/vajexopesagalixebuxo.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/kuwizemadipibuj.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/zigulabaxasu.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/1449589807.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_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 10684 bytes
SHA-256: eda1ecc663fd231592ca1c6c20446129665b7cfdf82b950fb37611b6d2c953e8
font_02_sfnt_off000138b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B4 19216 bytes
SHA-256: f4712cbe79d4e3032968f8df6ecadb9b83c126ac52553ff0324e55d1a778655a

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