Malicious PDF — malware analysis report

Static analysis result for SHA-256 d933b8c1bfdc2b0c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 21:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a2388ef8a9d67fb27303ad5aa53b646 SHA-1: 156b74169da3d26bb4a6a2c542860c9b4d0eea95 SHA-256: d933b8c1bfdc2b0c5477e6715d8aec940ef7d20ab8a0fd9dc8fc31c67b12b3f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=mobile+hotspot+apk PDF link annotation
    • http://ijfbn.com/editor_up/repof.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/tobefakegixotag.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef7be359be---tulupi.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/pukulazo.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/m6j7q8udo78vgp1o438d78l48o/68180388115.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/jidigukalozolakiteboxu.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/83855762657.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81fb1efa4---kulodobefagalelobuzom.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/maxasiperux.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/wiwuvumivobeg.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/xizetofomujuj.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109170009467454.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/wunaruveforodam.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://beveragesgs.com/userfiles/file/24338367204.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/33257609518.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138651f98aae---7751556276.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/lupik.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/wewunuzalubu.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/61612677783.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/repaxagobelabupinupora.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/67840231310.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/61922366712.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/gibewedijojomubavila.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_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 10372 bytes
SHA-256: 1e7f9c0992ae07c9f34ff96225857ad09acf4434501dbfa802cc8b9b744bca62
font_02_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 17912 bytes
SHA-256: b10eaa447be893d7719421e1b8814de444a8eee7a8bcfdc47dda952af80d1597

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