Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cbc2fb8a55e50b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 04:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85d4ee6a4bd2bb745030c2afb340bc68 SHA-1: 14d1d0075d377e44f1dc3a5b47257d57185f99ad SHA-256: a7cbc2fb8a55e50b1e3cd37afd0ba8f81dfa2043114c31974a52e2cb9120f1e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135077403f66---firiniwikuredosowexunujot.pdf In PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/jotozomezux.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/sijorabipemajeferu.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/notuzag.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/76680866775.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/2299240670.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/fodufinuponuwe.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/xikixatase.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a6ca78d1394e6bfad2dcf93a9a1aa3b8/gutox.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/63348134636.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/ragexanegogabugekikafoto.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/mitatevamukugivazuku.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/e8cb7287917866658b9e8ecae058a48e/18550651112.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/48641468017.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/80867256402.pdfIn PDF document text
    • https://bfull.ru/uploads/files/resabeduxa.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/89255878366.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16132e292e2d2f---88097843181.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/nefozexevidurinoziti.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/23273350026.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/pozumejekeseragutaz.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/8389395002.pdfIn PDF document text
    • http://kahasat.cz/data/file/getinediguvafebepero.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/lubivixisowijovapizon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=think+big+and+grow+rich+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_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 10736 bytes
SHA-256: e0924e1f10e0de9d0691b9578173717924d1e28131113ea7170196e58ec32285
font_01_sfnt_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 17792 bytes
SHA-256: e5cf50f17465c07d05e8700ba0c68f83912a5102f3637bff3d757a2e0b26356a
font_02_sfnt_off00011b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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