Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c97cb831ad99cf…

MALICIOUS

PDF

73.7 KB Created: 2021-09-14 18:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: edaae14d256d93b7a27784bb650dcf1c SHA-1: c2d4fee67a8422bd1e3371ecab45e9b12965566d SHA-256: 17c97cb831ad99cf53b52da143772b3d1e7c23ea71d8423539c41c808052155f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and compromised CMS upload links indicates a deliberate effort to distribute malicious payloads or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=your+first+year+in+network+marketing+pdf+download PDF link annotation
    • https://varida-tech.com/ckfinder/userfiles/files/75750605364.pdfIn PDF document text
    • https://sergiomauri.com/images/file/90394061281.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210913224533888.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/77971698087.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400402a59b8---xezuja.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/18d3531036281898e1fd80b059aff968/kimid.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/95923489873.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/49067218622.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/26567399622.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d87a913f6d---wufutozokepedudetoni.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/koralureser.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/bazilesep.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210902163054888555.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/talefowukuje.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/47342149814.pdfIn PDF document text
    • https://securitydm.com/slicice/file/tovutokuxokuduponi.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/29863338411.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/23750545641.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/8165127068.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/60acf5ce0e1899d2b3d656b734e12439/48731800253.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f53ca2b7be---27379392797.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/lirujad.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_off0000bc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1C 16644 bytes
SHA-256: 4e73c174a1e4cc9faa5251d21787f2cb3f9f3e86505fe74b3eb0ae7dd1b778a9
font_01_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 11216 bytes
SHA-256: fdb1ecb3b8e8f80dc9de2b6df6c8ba513002cf992b5d0268bc6acb33dd982a85

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