Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19bff2ccdbe904c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 23:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9be0444c7548b1a1586055c4c81c1034 SHA-1: d28c97a73c520bf92417435bd24221c81328ea21 SHA-256: c19bff2ccdbe904c410bb93aac3a676ef785cfac7f73f33326be5406f53a18d4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the nature of the URLs and the detection names imply a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/08df15dffcfa8d253bb466a4ea36e801/fulelarekono.pdf In PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/remezuxowefugifa.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/e6da0a03583ad05531a07fae6217e9e9/kozoduwuv.pdfIn PDF document text
    • http://torgoborud.org/images/file/78660944548.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/rulol.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/golifap.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3c0d2d7b---wefanopo.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/12491728156.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/80008977699.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/98039647788.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/75045062724.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/3768499026.pdfIn PDF document text
    • http://sun-eko.eu/files/file/sufokujowofugane.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/rilexuduxoliwasal.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/2837686312.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/33453656956.pdfIn PDF document text
    • http://analhospital.net/file/files/8465653948.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/zonutopenapoxugawusaxegew.pdfIn PDF document text
    • http://deauville.ru/files/file/16430272393.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/8976502823.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/16093034990.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/josonofizipezibeduxokug.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331f1f7d391---12470699025.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/degigoxogutex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=run+android+mobile+apps+on+windows+pcPDF 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_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 17756 bytes
SHA-256: c07d22aeaca64f2b3e4d4b7edc1b75f5cec2f7cae7f47d27ff11a07bbf59d806
font_01_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 10948 bytes
SHA-256: 811aa2d8bed9d25bde535327dd3ffb7af87623dfa0f9f01ddabca633a0058cf4
font_02_sfnt_off0001202c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1