Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfdf2b24ddceb80…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 15:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 721c8190be8367885003fde6b9a7521c SHA-1: 1ad40295be13b14537cebda78ac3c5df6bb050a1 SHA-256: dbfdf2b24ddceb80a444d2a03204e10479918e012383438206a51c345728edab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The embedded URLs suggest an attempt to trick users into downloading further content, possibly malware, under the guise of legitimate downloads.

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://ajansnigde.com/resimler/files/nuvivelajemuwa.pdf In PDF document text
    • http://tieulongcopro.com/luutru/files/fowegubolepobulituvemo.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/leturereboto.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/kuzigisosovoxibapagoguda.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614189ffbff07---pujamanovunusubamamusiw.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/21811907041.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/eed75b8383a97f2fc19d7c96aaf6555b/wowilupibukozupu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d78f2aeb42---sipinagefezogotemevadake.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/76780675342.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/vovavotazanukukozo.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/kurujidogufoximivilaxar.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/87304562721.pdfIn PDF document text
    • http://grupophi.es/uploads/files/xovewagole.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/74904908189.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/bajumuzorugade.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/93328507297.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/bofujug.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210920_13E04E68BE8147FA.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/pezavovux.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d48762e76---68771994726.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/93064319185.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/dutabowirapaba.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109232254182204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+youtube+videos+android+tabletPDF 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_off0000b09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B5 10748 bytes
SHA-256: 664bebd624d1b6cc8f08d712da3c6c30dc85d7b09af6f7a0308e08c062a9645a
font_02_sfnt_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 15868 bytes
SHA-256: 92fc7d91c3d4bf703c18f742dfe337ae58891211eea1370ac43cef5ca6d0c5f7

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