Malicious PDF — malware analysis report

Static analysis result for SHA-256 441dd14ebc89df27…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 14:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a8b84ddd4304f10e1d36121aa410f24c SHA-1: b681bc81608c008df69ebb9af5fac54dc6adf70e SHA-256: 441dd14ebc89df27dbae8c434fe02cfe9deb8b4da4827a6052079560a21d6aa9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with several heuristics indicating it functions as a link farm hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.somdattabasu.com/fckimages/file/retebobijuvigeme.pdf In PDF document text
    • https://xo-sound.ru/userfiles/file/papoda.pdfIn PDF document text
    • https://luminex.pl/upload/file/60636447197.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/95880876313.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/ziridilofuwuzisadokexon.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/83180519725.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9a0bca8cb---rimemalemupogixisilobudiw.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/wudetofasarurevaj.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/39631635600.pdfIn PDF document text
    • http://salespate.com/userfiles/file/xufodulemuzab.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c978a35731---83607751930.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/44817131766.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/60873374241.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/tunolilinelugodetifi.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/kaginogo.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/lepafanufavepira.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/wevawudokasubirawewoji.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/zozukofuwukesavo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa6aee4d67---kutulafonevoduraxepab.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/milonoforejerewawuvesir.pdfIn PDF document text
    • https://soechi.com/userfiles/file/15396595282.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612a64facebbc---xesibaberoketazi.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/57e33c152655bc846058c6d808d79f7b/85785291380.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/33048176295.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/wixateg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cdca+dental+hygiene+manualPDF 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_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 17960 bytes
SHA-256: 5f36e327d5511b39f0f60576eaba4b22f815bdadea81e96ed2ed6c0f1bfb0701
font_01_sfnt_off00011120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11120 10676 bytes
SHA-256: 17a57295114fffa07afb1bbdfe7fd3a57439a1ff4e3700b0b513f49149994da2
font_02_sfnt_off00012930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1