Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3ff2c2383ce162…

MALICIOUS

PDF

93.6 KB Created: 2021-09-07 13:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8c2bdf108e3464a455ef82ed824ce84 SHA-1: 4f6f40d559f2a34bf71eb40cbd66a23479ab014c SHA-256: 1e3ff2c2383ce162522d0c83b77da8aac13185038aa4df01e9d10a7a2a1fed2e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the document structure itself is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://catamma.ru/uplcv?utm_term=kramer+via+go+manual PDF link annotation
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52d2c85a4c---68064428195.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/82007495511.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/bilefikavogejotiraxadidi.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/witadalasamubowegiruba.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/3a2487676541f256a9c8b690d9baef83/26987341911.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077769006675---96582702712.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/23771350911.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/bizamivine.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/fulimuraxuvezenujo.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/97574625860.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f113c0d80---81568300448.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/43638236914.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1626195531.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/21996116887.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/ribekinakarilelevonaxefu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/q633t90qth6mt6f0t1i0t0cr06/2306201024.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/dt1i8652tlk3722naj744tj4l5/1051020061.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/duvuwujulikawoseko.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/43154247802.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c3c9accd3---72452776797.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/bifedusuxi.pdfIn PDF document text
    • http://carszana.com/image/upload/File/fakifosejaruxiva.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/wotawudupazomoge.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_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 10344 bytes
SHA-256: cf52c03d77a1204a0c878a8c358d59aa5a803d4f5c702c58b773ecb47b42c9bc
font_01_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 19300 bytes
SHA-256: b1cd1e2accab2d718438d10bff41ced97b91f13d5bb25dd0743860ebac1c5d72
font_02_sfnt_off00015096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1