Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48f7a3d5fd2b4f5…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 08:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 27038053b2978c4bd67220de5180cf2a SHA-1: 9ac31155c48aecde0f4f939306f04bbe6846c1f6 SHA-256: d48f7a3d5fd2b4f5db464f8a11fc9575dc6bc40191e2fa1e69795b917a16dd5b
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating malicious intent. The heuristic firings suggest the document is part of a link farm designed to redirect users to compromised websites, likely for malware distribution or phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://garglob.ru/uplcv?utm_term=kali+linux+manual+pdf PDF link annotation
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6i3k3atlk40138nbh02gfijhpj/20434671090.pdfIn PDF document text
    • http://rld-carbon.com/file/79301546749.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/51020362195.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/tituxekelivejosasunuweju.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/66998217910.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f907bcc9423cc9c6f9088fb947549a8f/natuzarebonizokonuxekebi.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/vovixipadamewi.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/tifukawulubuwodesunuk.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/39270122934.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/dinixenaziruv.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/fakegifuvolut.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e6956f7fb38deb5cbe20cb4fe0a4e5d1/88391359392.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xajegejajatil.pdfIn PDF document text
    • https://panama4d.com/contents/files/sefek.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///56907524508.pdfIn PDF document text
    • http://telangana99.com/userfiles/file/27244163884.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/53892321156.pdfPDF link annotation
    • https://novinfasteners.com/userfiles/file/berobu.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/vuderaxixuwinoz.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/sosurinamitiroxuva.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/nipaxivixesa.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/feloru.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/88162346027.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_off0000b2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 10232 bytes
SHA-256: b154e4bf65b547214e66ec02d3a39203100ceeacf7624d298f8a8b402f983bf0
font_02_sfnt_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 18024 bytes
SHA-256: 258af7071b75f4de4240b7363ce2db4d75c672297024a742d171be99178f964b

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