Malicious PDF — malware analysis report

Static analysis result for SHA-256 363c4159fb835aad…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 07:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b9d39bdbf67779d2a5848078cdda0616 SHA-1: 5662908e2c30b8c30be4099415eaaadf7945d9b8 SHA-256: 363c4159fb835aad56a5c3b3f2bf2f90eb249346fa513ca841fd1a05df5dc49d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=gomovies+telugu+2020 PDF link annotation
    • https://mudraconsultancy.com/uploads/files/13927125251.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/wevaninilezixisezem.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/bidesuladir.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614282f2afad7---19674240831.pdfIn PDF document text
    • https://questyme.com/userfiles/file/95280657622.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/77716385053.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/nagigojozumu.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/4314998722.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/konefowobofujuguvor.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/76883287946.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/81316289102.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16138bfcdf1be1---wuxuxedimagej.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/97240367757.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141ba5480dbf---25183333868.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/56694794104.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e992571d8---80578035052.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/66470727517.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/22876140968.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/xikakujefuked.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/xujoma.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219175494758.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/84807861646.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/wezuziwe.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d7aa286ec159b3469189f4c6841fc876/63282703840.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_off0000e2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F3 17880 bytes
SHA-256: 7172d0bc2fbc069933fdb694cdc8e777dead635c174039aaeec8c97d38d46298
font_01_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 10532 bytes
SHA-256: 8fc07589c66fd7dee6b239a2dd0f8c171a329187d0d7407d01b964a48ae326b3

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