Malicious PDF — malware analysis report

Static analysis result for SHA-256 957c18e2f4b88aed…

MALICIOUS

PDF

96.3 KB Created: 2021-08-03 09:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 9ffe5c250c49827f3eed361e202022a8 SHA-1: 40c9a4c04693eb8e233c01758deaef6e31086ac9 SHA-256: 957c18e2f4b88aed24d1f1cdda2c918f9346b930eb6b2df1a4e6783357a07ef2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=what+happens+in+the+gym+scene+in+after+we+fell PDF link annotation
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/208e18668ad9a212476022fba74e5c75/25389151676.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/53358072422.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/nibijutulidebekabokexusiv.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/sodugifodopodeguperaxufik.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/l958sbou7fe4ptuhih5hdckgp0/rizeberevusesopexe.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1430b01dbe471ed9ebd162f0a2e14095/64768681766.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b1674e2983b---kizoxabokuxonezofefod.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c611aea0---5999694686.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/geligakojesakaresu.pdfIn PDF document text
    • https://webmenuplus.com/images/file/muruzapajujigipenirebu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da50816d1a---zivijanevod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3986b0a8f9---dikiwigafanotirijojuvini.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f793f97233d6fa452dbfab3cdd947c1c/55729568120.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/22253340132.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/77279483016.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f88349fc8---bezonalo.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16108b0cc45a41---xozuv.pdfIn PDF document text
    • http://446888.top/userfiles/file/89458652545.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/mp20o9lll4n2rl82li2b4bpkrn/19018076049.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c986d3ab1b---duzeb.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2272e036---40408526595.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/n0qoua78gjvgpmagkisdr1lsk8/46424386500.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/50e096b2b6295e2106cedd2b54066d3b/58067154902.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3bc93c24e---gurotonitubokinolutexa.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/todagajexe.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_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2D 11000 bytes
SHA-256: badd67583592b396db49a9af8452fd52588f4cc312137d55b073c6d5c5d47964
font_02_sfnt_off0001479d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479D 16860 bytes
SHA-256: 6c7446eb37ee9937ff1e1496ae21cea5fa64854dd595db3334694ba176a98856

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