Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d4a73b7e0cee77…

MALICIOUS

PDF

85.8 KB Created: 2021-08-13 06:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30364fcb5a5ab6eacac0251175bc06ee SHA-1: f32937ea7d3313bb5b06470db0968c4f1ae280ca SHA-256: 54d4a73b7e0cee7791b1d9f1b0f4e51d6d41391e7c62d76a38bf2a17c4af41ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

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://camberwelltaxi.com/survey/userfiles/files/31049919437.pdf In PDF document text
    • https://mps-india.com/userfiles/files/78753474645.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/52743712497.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/suzuxuwabis.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/senokorejuxo.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/13838894826.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/cd2d4964011f08df1ae483b102df84fa/giremomad.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731466019b1---sogaburogagifulowegiwisom.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/47899552121.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/95883197428.pdfIn PDF document text
    • http://avgdesign.com/userfiles/file/karokodadoruzalapex.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/7d66a2c407fdf52eba171936fe67d982/82186541421.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/58917363214.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2416b86130---61082007791.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b574ea80485b49b5e427d5b49f0e2ddb/powalifipukexolutodaveti.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/89111824461.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/pinejuzovo.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/81146115478.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4c9d5d560589fe28da722f74e85b1cc9/linomitinaximisivudodep.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/miwunogazoxutadunel.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/78050003819.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/1845493468.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/muvuxibo.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/nurumozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=best+th13+farming+base+with+link+2020PDF 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_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 18600 bytes
SHA-256: fa97d6afd56d7f8d78a8d0518773775f4d9c1c2dfdc3f134b9bf3582f4d5f4bc
font_01_sfnt_off0001141b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C32 11380 bytes
SHA-256: 21bfee12d10ef5314c37aa6040869c775ad30114e002512d7541c1ced5874eff

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