Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e10c5e80e3a0d8a…

MALICIOUS

PDF

88.3 KB Created: 2021-06-30 21:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b2df2d5b55a0b5e31e9fecd41017b200 SHA-1: f2168b648423eacd79624ea5f9f75648e30288fa SHA-256: 6e10c5e80e3a0d8ae34aa735bdac2a75eb72d05bf6557f271a91b2de7cf4625a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified the PDF as a link farm hosted on compromised or disposable domains, suggesting a phishing or redirection scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of hosting malicious content on potentially untrusted infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://vibangthuaphatlai.net/uploads/files/97130100588.pdf In PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ec96e4d1b---lofetarekineruj.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/zajuvitolivejojagowaku.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076f1f880c64---78260832341.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/parsacaj8iphb8ilvul9u4kr11/62290037253.pdfIn PDF document text
    • http://ledins.lv/cms/file/vakerasinorumafilup.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/19928592179.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/pagajijig.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1829be071184935e03a12dbce2563007/82441108360.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/xotulebuvipimuzadi.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89191ec8b---bagojifanatojigibebavuk.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ef997127e---xewatufubevimipixexuter.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/popazegefuwaxi.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/sj2hh4ode7ojf4afl1qoja86a1/zudemewuged.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/34599319799.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/jemipibubofomowafelupo.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5feb1ef019---98575360754.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ih1jsateg61auodkre4f0ipupr/sodir.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1fcb204cb5c9d62347b77c5188f8b109/jumigabubuwizesive.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160834b0ccca51---fesodusibinuliwisewoxojis.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/23014415053.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4b889a7f---31075299717.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3889002d5---sirusoxugik.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/40651063795.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/10994740386.pdfIn PDF document text
    • http://trivio.it/userfiles/files/xefefoxakubidomukituniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=windows+7+multiple+choice+questions+and+answers+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_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 11260 bytes
SHA-256: 8e843122cfd642b3c18523bc2e43da2db401678c2bbf5273f8c456809a45fa71
font_02_sfnt_off0001263a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263A 17452 bytes
SHA-256: 5d690b02e3150f9d6c82f5d0c52ba1bffe30adaf3ce152f6949c3905bc9a6340

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