Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ce176038088f7e…

MALICIOUS

PDF

82.6 KB Created: 2021-08-21 00:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4e166adc403ac8e231965712569fdee2 SHA-1: e401aeac2bcaf166e6f848b44c8347f1e582c6dd SHA-256: e7ce176038088f7ed032426a3053773f847a83386506493aedbbf8dcfc533f9f
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608576c9a7285---gikupuval.pdf In PDF document text
    • https://stratasphere.online/userfiles/file/fefekovowogepanixode.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/vipomujelujete.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e741214d8---nenasumiza.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/8de7412680e618333397853282841727/70577380488.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/gibaninikubibaj.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/14829359074.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f35739f73b---90196333148.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/kavujilajevam.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd5540663e---luwadubutofikilefapujegud.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/sitotudapitabodizo.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/81176989923.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/gafuvizubutejukajalegu.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/88335979912.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/61707220053.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/dc8cfbb0f83820c3ac4800036f4eaf13/tapeduzogopadug.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610336efaf79c---xilelujikerap.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104f45a3b680---4128729026.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bdfc82e167bf223339595767a4c48138/zutukowalexisanebegebivol.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/18273819096.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d41d47655b---bozate.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/setoxomigopuwususowi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607acabac913a---butonozofejutorifej.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/81646709923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bahubali+2+movie+download+free+in+hindi+filmywapPDF link annotation
    • 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_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 11176 bytes
SHA-256: 0f290e1b48b216e0f10c607eff7381deae3742379c559ea3d865895a4c0ed31f
font_01_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 16832 bytes
SHA-256: fe8a59b232bf44966bf3926ce407038377343bff05732c93551d2160a46f1d76
font_02_sfnt_off0001244b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1