Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a32bf734733ebbf…

MALICIOUS

PDF

69.6 KB Created: 2021-09-01 22:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 081a7747822ef9c9cef62f2b5025537a SHA-1: a7411daa692f98aa14b4e8526131df17dd6f324c SHA-256: 0a32bf734733ebbff9d2873e867d23a154c25d1ebdb2a3b084ebc54de5e4380e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the heuristic firings and numerous URLs point to a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://luathoanghuy.com/uploads/files/dubavomeruj.pdf In PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/gomunezezaziv.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/39h8euhooha0r2cp2qecqsktk2/nivosafaze.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/76562956614.pdfIn PDF document text
    • https://tavio.ru/files/file/67572579011.pdfIn PDF document text
    • http://lukinserv.hu/file/48352397366.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/43650341505.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210827_A7CDECE50ADB7CC4.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/taparemumav.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/47829153208.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/29235726331.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da338a802d---167798514.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/jowosomolemaped.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ff2aecad---57876559669.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/xobumawutug.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/42359219916.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/watunemutu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161013200487e9---zidavapined.pdfIn PDF document text
    • http://reylab.com/userfiles/file/najefukamefoxe.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/tatipusoginekep.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237f5502eb6---zafodopuxotufexuzazukobat.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/bimivagimujuva.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/13cea501ad929bb02ab143f0fc0f3027/93249834400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=creatinine+by+agePDF 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_off0000b2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EC 15776 bytes
SHA-256: 728c006f1b0bdaa71a227b7f7539d11277adeb6faad657bb22ffde67892c9c27
font_01_sfnt_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 10236 bytes
SHA-256: 1f61506e64b2884d91e96a377976aa84e746b95909259dd32e598ab2254d7aea
font_02_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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