Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f75604fbb48b63…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 19:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91247b786321e796a2a9fdf606f2a609 SHA-1: 65c35541e75ce8ab85f44b4eaa7c66736cfda36a SHA-256: 54f75604fbb48b637dd69f60c56627e0d22125628902c9fae4e7844fc47a3351
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains embedded JavaScript and is flagged by ML classifiers as malicious. It also exhibits characteristics of a social engineering attack, instructing the user to execute a command, likely to download a secondary payload. The document leverages a link farm hosted on disposable domains, with several URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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.
  • 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://elosc.com/upFile/file///ITX202109051359052966.pdf In PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/nonuvurubexifo.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/joxepusejomabevonakuf.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613d081a2749c---jobejefutanoxanibemixuzos.pdfIn PDF document text
    • https://angem.fr/userfiles/file/97911498242.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161396a9580e46---81280822307.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/45889934670.pdfIn PDF document text
    • http://kdekdyjak.cz/data/fovedekepujokojinumobep.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/zixezawu.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/nobazipelebafedoxiraga.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/42209337579.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/96043458269.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/31916860297.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/35747146240.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/pisadas.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317f59d7966---43950666143.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/kitafinorubo.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/79907811781.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/71669523295.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/89336305832.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/lekukagevupobe.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/nusifafovuduso.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/71560040138.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/89572262746.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/27533920999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=blue+square+around+apps+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_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 19884 bytes
SHA-256: 414b932dc9422b8df1ce32fba9a83f1913f0c92364785912283a4f3edde60b85
font_01_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 10584 bytes
SHA-256: f80f2af54ce63734793fac4c1879ec96b1f5d031eea1cd51140a9ae5cf8be5a3

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