Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9c5b6dfeb9b7d9…

MALICIOUS

PDF

91.9 KB Created: 2021-07-08 09:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5aaafc3ebda2159906aea95fecdcbab5 SHA-1: 5b052dd890c152fb99eaffdeb973218ba1d10daf SHA-256: 1c9c5b6dfeb9b7d9059749eeb9414ec2e7de8da9a9240371ab21efe83943ac50
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on potentially compromised websites. This structure is indicative of a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10728a01d---nabofasewonav.pdf In PDF document text
    • http://cokhibaosang.com/media/ftp/file/zenunisemitadisiganane.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/nukobivozepisaxi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff48d06031---91288174429.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072ed53d1058---30790818774.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/184000945360b995234309c.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/61510719582.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/d19mq9dr51m97q5s49qc0mrkrl/52055314150.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/4h8okoop7k0ll4tic384hg7up8/gowuwu.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/tanejejato.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/9s74ed6t0hdt2sicv53uhvhbr0/39311652105.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160aaac8d4d9d9---43812472119.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/152c96ad4672356d6c6364cee2995768/wobefetututonozenibakaso.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a446bacd4---73110538817.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/rewegasurob.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/80545503187.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1246fefc159fb7601145b8d22756ecf7/motusu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f230662dcd---xisafuxotobizasa.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160999015abf66---fulegozodirarixerojir.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076263b6212d---9233240142.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/77362750197.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-3/20210603125404497131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=entropia+universe+hunting+guidePDF 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_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 17368 bytes
SHA-256: dc2baed7dfbc3c28556f3ce80d3218a7be56d7d3ace8b9cad8f3135cdb9349ae
font_01_sfnt_off000131d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E9 10772 bytes
SHA-256: 72b889ea51e2e51954e1f393ed76f6cbd329e783b151263b4a71b59a0a16a4df