Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6504a634f437980…

MALICIOUS

PDF

75.3 KB Created: 2021-09-26 02:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdd4cf7be23c0f1b3ff81c0d513f181c SHA-1: d4fabb4ce8553845b00f424e17cf743189a7779c SHA-256: d6504a634f437980bb24c69ef717970dec85f4f066d5019e1e93c958876c41c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution, despite the absence of executable scripts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://retailcop.ca/files/napokefenipikukovikok.pdf In PDF document text
    • http://mtcnx.com/upload/fckimagesfile/32869847313.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/49248945408.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/75234228661.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/mofolesesuvika.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/jigugum.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/41867885370.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/dejojebatepesakedapuki.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/kikisuzixusotomizove.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/sonofiribadebur.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/kibalepivolalenisox.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/14052339571.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/23271956808.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///99603327257.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/44079620081.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/duvuxabewaviliduxusugo.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/gotaxiwavedusurijato.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/94290025667.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/ninizoxudusipoweziri.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/nijupubokumix.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/30024357491.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a04f74f4f9---24362973222.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614809ace0ffb---jisobemis.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7edbb019---66793446327.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/41217871255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+anime+free+hd+apkPDF 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_off0000b8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 20884 bytes
SHA-256: 3d0080d6264f1bb43cfe13789575b8398444dce66a2857b564d3422f965b3146
font_02_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 10636 bytes
SHA-256: 11f042e6d549032a7d0eaaf64e78a7fbf14fdf6431492bbc11ddd694592d7ced