Malicious PDF — malware analysis report

Static analysis result for SHA-256 23735e4508259875…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 18:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5caf679d5b963fd230101c73c42dee9b SHA-1: ee93146c9460aa0e9de280fb10b1c49ca5d93910 SHA-256: 23735e4508259875a2ab48039c2612a9f74f410b6888dc6652cbbca20f41c17f
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the structure and embedded links suggest the PDF is designed to lure users to malicious sites, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://etenindex.nl/images/uploads/82806452616.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/79f3a5dd6b55de75ecc6fc6a1ad7ea23/bukadijagopogurepenug.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/kipapoxumijinudadis.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/xutisiwagabakowekowigapi.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/pojokowokaribak.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d14d0a25---betutubur.pdfIn PDF document text
    • https://umartravel.com/files/4229111447.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/72ad191781296b2cf25dd00623749a2b/44307205115.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1843b744a3adfe1fa77f080ea973c7e7/72529894281.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/varedade.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210907_102736.pdfPDF link annotation
    • http://fcvperu.org/data/fcvperu/userfiles/file/masekareri.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/pakunalovatetifepaga.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137892e1d10e---ninodakazubonubipekuwu.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/72876614577.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pepinobewijowakef.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/50389891265.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/limukiruvoreni.pdfIn PDF document text
    • http://dd-eng.com/files/files/matetunepeza.pdfIn PDF document text
    • http://trivio.it/userfiles/files/wubirerevel.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/70499322183.pdfIn PDF document text
    • http://freeski.hu/freeski/file/62878211565.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/sebazovixi.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/57941082058.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/60750749251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+degree+of+latitude+is+the+equatorPDF 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_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 10768 bytes
SHA-256: ddc2bbde3c1783d1a26cb108e584b7cc408bc0ef7d525f534dc9ea75e4a62917
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 16960 bytes
SHA-256: c5987d533f177e30e608fee6d969ce468758ec5dcbff2faddad351d37dbdc05a
font_02_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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