Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e64abacab21fa4…

MALICIOUS

PDF

78.8 KB Created: 2021-08-12 07:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 962101e8ed72b356b7db94265d5abbe0 SHA-1: e25308b4001136b4dd6953ae716288f6b06d0942 SHA-256: a7e64abacab21fa45bd02c0e2a871daec39abc98455cf588fc6429e586c1da62
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm pointing to compromised or potentially disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smclassof57.org/clients/34860/File/21877151892.pdf In PDF document text
    • http://activesolutionelectric.com/images/file/29071109479.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/55591741016.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/razuduputafubuzokafesixi.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/fajomudas.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/mixuw.pdfIn PDF document text
    • http://otczenacts.com/media/files/12430879156.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/28645250316.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/lugimegito.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/vajijek.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9j5sse267seoquk4r161sqt73i/moxubiteviwugukodapezogox.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/55674261507.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7f79e439---21930651957.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/81398818694.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/vabalulovatoxunut.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/buwikukalaralujesowaw.pdfIn PDF document text
    • http://miracleschoolministries.com/survey/userfiles/files/46337438454.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/77184916573.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/44773266311.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/29862541310.pdfIn PDF document text
    • https://master-service.ro/images/file/69714408946.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4f24ff4f---sukat.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/29037730083.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/gbg3n7ahsc2uo9clvrlo17fene/57285608400.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/guxat.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/59837601119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=diary+of+an+8+bit+warrior+quest+mode+summaryPDF 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_off0000cb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 17668 bytes
SHA-256: 841ee2cdbe50b22b09d403ce995555a42dbd1b7bb2d430134c164bca968f8c67
font_01_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 11264 bytes
SHA-256: c28aa64d999d24abfd6274e16b2f373cf1f4bc92a1f60a75b1bffba96f1a7e0f
font_02_sfnt_off00011482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1