Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00603d4b66d29ca…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 00:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c22524459ba87db3b483e60775828dfe SHA-1: ff897b644bb7ae03b8e10a59422fbbe43311ea01 SHA-256: c00603d4b66d29ca75f558a859e6856c7dfd7f3afa6b03ed9e82d765db9d06f1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further support the malicious nature of the file, likely used as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ketchas.ru/uplcv?utm_term=tika+tonu+words PDF link annotation
    • http://medica-brno.com/files/62767978390.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/kedozezogeloban.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/3717750711.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1r23osvn2nvi0u09ttfcqf3l67/34671513619.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141e00232810---xifedupozugopizi.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/49372546335.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/fukezibikex.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/zerokogu.pdfIn PDF document text
    • http://rinsacars.com/files/others/tulekit.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/najilugiziti.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613074a1dcaa7---1458070969.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/gopemu.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/56922102420.pdfIn PDF document text
    • http://machin.kr/userData/board/file/gofexepuwaterisogufilapi.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/56404741423.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/perinamun.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210904103526.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/gajurox.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/37942273578.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/53963472036.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c934c41a3d1de15dbd371aa1d728464a/fixobufubiketoxawafizes.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc915bca8---74461722838.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161475308ced29---vewubilapiviwas.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/pudubo.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/nelutadimewaj.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210917_003108.pdfIn PDF document text
    • 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_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 17484 bytes
SHA-256: 2708c46a02acc3d9f025a6ecbcfe15b771d277d887fbbdf14166b18e46c9f6a8
font_01_sfnt_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 10304 bytes
SHA-256: 08a143fd301577907d34699e0023bff4872f32f1bfe149d58de8adb65e5394a6
font_02_sfnt_off00012bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.