Malicious PDF — malware analysis report

Static analysis result for SHA-256 80243540fdf56a7c…

MALICIOUS

PDF

75.1 KB Created: 2021-08-28 08:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b7d5c7d3c8166f7b5e4743ffaa289b12 SHA-1: 5167ef4020dc8a4393cbbc898c72e43cdb8d7f90 SHA-256: 80243540fdf56a7c365bf50bb6d998014a011e6bc3e155671835094cdc3e85ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The embedded URLs and the overall structure suggest an attempt to distribute malware or conduct phishing attacks.

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://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb9e96301f---bosubufoxoxujotobalepe.pdf In PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/15d4ae82a3aec53caff022cc9c0b6037/rumataparalozuz.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/251832484117.pdfIn PDF document text
    • https://memoservicesrl.it/file/xaratuz.pdfIn PDF document text
    • http://sswjeans.com/files/sitibodojabadagidigadoda.pdfIn PDF document text
    • https://defi128.com/userfiles/files/62927676132.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/vizaj.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/zifowuxisozak.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/74031661596.pdfIn PDF document text
    • https://fallsplat.se/file/wirajobiwewuvuvimeni.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-26/20210626065626904785.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/82845ca05e6c2193cc659bdf73923dac/fikafimije.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/54233b60c172948bf000e0ec61c4cb9b/64984327911.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4f4ukrrebrq17sm5g378d30551/52478041335.pdfIn PDF document text
    • http://gdgom.com/upload/file/210801122827004922u1ut4xs83gmu.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/26287586335.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/fipepapujojepagoxokab.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c569566ada9---36494604658.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/lefudunuxigikuxeduritid.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210726_8E23688B4C3DA87B.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3ea5cb013---golalivawu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83d9e9738---setesuzujusugunimolukiv.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/1cbm03r9ksp126mrijnqhpjkql/92478998357.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/zamadefosutijonul.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/jukesojulorumatorago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hrithik+and+tiger+shroffPDF 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_off0000c5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C4 15528 bytes
SHA-256: d142b5c36ecefcb252d10ea1b00206f406625d35aa8aae7243db0ffe44fbff06
font_01_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 10672 bytes
SHA-256: bbbc8e0c9d613fe90b86e58866407f1339ba30cf0df8d231a8a0315cbcf64360
font_02_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1