Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfeb281d13aaf90…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 21:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2078c6cd519ecc297314a35aeea7343c SHA-1: 6f15a3f620d2accdcc694405593a24c8ee0fe683 SHA-256: ddfeb281d13aaf9088724c1c11cf1ac32656019a94417f71574e8aafd86049c0
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=how+to+mix+cerulean+blue+acrylic+paint PDF link annotation
    • http://eskuvotoszkanaban.hu/editor_up/bomodenomute.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109180306064091.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/lipeted.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc57f0640a---69497055442.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/xonoru.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/ritudugadeg.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/kubafadogobupozi.pdfIn PDF document text
    • https://tivicom.vn/upload/files/48326831565.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/gukemepumufasen.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/webeganoliw.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1bbcf842c74e125a7b0558850f7e3459/pavinajatimaxezokukavo.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60380252988.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/tekiv.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/30352042198.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e3f9ec39403b77accb1c3c12a2e0929f/68815290853.pdfIn PDF document text
    • https://superpart.com/files/19549913467.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/tuxudopakuno.pdfIn PDF document text
    • https://robertbah.si/files/file/48836306008.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/38528439036.pdfIn PDF document text
    • http://eichler-kammerer.de/nazarimenidojunaka.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/mowaxiferubiwuf.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/72096925281.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/javajukeju.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/mimumada.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_off0000b3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 10900 bytes
SHA-256: 613a5d1130ad2913535e4dabc107c9d1ead3bf14183dcdd818b9060f8b0d46e7
font_02_sfnt_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 15668 bytes
SHA-256: 9366ddea548146dff6e6bc0db2c75ace345b62e4b5f49e7ee86c22766cd3d869

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