Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae13c805235970b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 16:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfdfc4cd2789af35e721c9bf67a40be5 SHA-1: 8ffae74473f796aa4e0bbae24fa08afe7557b933 SHA-256: fae13c805235970b20e382491a92ab0aaa1e5f0f1875f42c209b8d42deb0237f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' further supports its malicious nature. The presence of external URI links and link farms on potentially compromised CMS uploads suggests an effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/oinja8hnqstljj9mqonp3i2h1p/wazoxodososudoke.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d2bdddb2efc6c885732c1b711f1b3128/xisesusitubavulas.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/81173841324.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/24213274835.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/61177435421.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/77352152221.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/murepowujabojobem.pdfIn PDF document text
    • http://domainecomps.com/documents/files/91804244501.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/11580163272.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfee8367dae---kofusasekiluvanogamazijo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161176e3581cb2---25878833106.pdfIn PDF document text
    • http://pima-alarms.rs/slicice/file/gisatutuzegaposozez.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210611161814.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/bamipide.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e1e25cee---55363058418.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/84488441815.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72828b11c3---87482321103.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/9a04937826ac6c169955b8530edaaed2/jurej.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/82613612570.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/vuweladorigapobus.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/04/file/20210604_014340_115.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3640dcf67d---78897651314.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/99445151202.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/57272437462.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/93753964497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+road+book+pdfPDF 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_off0000e481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE481 10280 bytes
SHA-256: d29611ae7ab4d3b2b5ecf8faf05ebb035ba6e81b3602ef0ebf31d66ec192fe0b
font_01_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 17696 bytes
SHA-256: a90476703e96b9d4b7b9e7e80aa8ecf570b6868a1c9ec7cd52c7c07763f25eab
font_02_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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