Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7cb63bf6f01bb2…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 04:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 056c52e93fe744771d43c9788caa1570 SHA-1: c06bea7867c085d1f6fb2eb315b8794aebea1e9c SHA-256: 1a7cb63bf6f01bb23fecd024f2608ad97c0e95ff580009a4b0a88affe6a6bdfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to compromised websites or domains that appear to be used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised infrastructure suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/jafamemim.pdf In PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/33775103455.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/68945450163.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/97437384749.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/24035129888.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/wufemitarexugidudijikipe.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b498353621---38478401685.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b01b514e3b455dd27ba43a3f90df68ed/97143784121.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/29153911970.pdfIn PDF document text
    • https://autoskola-scp.com/files/25244281332.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/ravokebabovezejamudeju.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613266e148d83---41061808269.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137460fcbf10---xasiba.pdfIn PDF document text
    • http://mlead.net/images/e/file/71730247572.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/biralogajipenalokonama.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/94apet5t2p1dmp13f7rjm62052/maredadopinamemezebegefem.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc274ee774---warev.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161375f212e308---piloluwatubekafazoforere.pdfIn PDF document text
    • http://webbuilders.com/files/file/gakezuwurijofojika.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/44544244152.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/rubejidekogavep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=panda+game+booster+mod+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_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 19356 bytes
SHA-256: 87b51bb67a7b516adf73eabbb53a6d2d7f5aa8769b4a242649db0a1931003a0e
font_01_sfnt_off0001142c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 10832 bytes
SHA-256: 9695b659a48e60dba48042afbce8dcc178f6a52a8055a980e33afb76d490994c