Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7416af4835a5cfd…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 15:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6777da683f6f56504c2e2d448ef88be SHA-1: eb02e48b0988ddb98ae60cff49666a1af347cf6b SHA-256: b7416af4835a5cfd4bf09e8ac3b5823da57780f5d025ac09a93a520d89ddab58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.andreivieru.com/ckfinder/userfiles/files/51251265387.pdf In PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/rekopikigojapowuzekirov.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/57cshd40li6t7n2rafrpsgbmqs/42405181625.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/turulujonuriwomalibozi.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/fidugutijaviwiwunibara.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/46266879179.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/80956313320.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-15/887c785c9dfefa3756640df6f5a8d788.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/memivorerukaju.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/96074657900.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/91350816167.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/61737645561.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fa85e890d---fubikibutexarudobolanojil.pdfIn PDF document text
    • https://castel.ro/userfiles/file/wuwawutavenemoretaziv.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/31308049316.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/tirowolodameb.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5af7a8a1f---10228297915.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16141f00494ee6---78145422376.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139051e89726---xudifagexesemosuko.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/nisexivumuvikojirik.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9f28ef0662b771e85a3000d9fa61a233/filegojulokejetulovaz.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/65550135203.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/midaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=clear+space+firestickPDF 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_off0000dfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 10372 bytes
SHA-256: 12c650881e25750c9878508b4b9a8745f8b332bcb1eaf51ca155c53074e8fe4a
font_01_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 18144 bytes
SHA-256: 932c143060eba66f934d1472ee661388d371a5d4eaf5089dcd834831b5985141
font_02_sfnt_off000125e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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