Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e70e29038f2434…

MALICIOUS

PDF

89.4 KB Created: 2021-07-06 02:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2981f3a4c3614bb7e01504f634a542f5 SHA-1: b48c70b72d324199d786c2b81bbce2a61c01df32 SHA-256: c8e70e29038f24348b6926b82e572c971cdb26cc32e3a05939c768d94bf20d9d
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 as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or engage in phishing. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://kath-kiga-bw.de/bilder/berichte/file/vojemeximuxatigizopetis.pdf In PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/resexutiduwetemifon.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/jufurujus.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/m1c1e5unhrdje95i86hio808j9/53551608714.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/25607087150.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/39758482712.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8aaeb98aca99f10a5ab665a1669d15d5/tawaji.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa589e0c838---popenafabogoxi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724ec829815---7095869731.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/6798428082.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/85c16c26a4a7408f5bb2023caf546465/93107952341.pdfIn PDF document text
    • http://medrea.ru/upload/files/pafefuwexofakizewemaj.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfe1162725---91299735439.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/63250677559.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/2500483169.pdfIn PDF document text
    • https://m3csrl.com/file/23997464482.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/79018053574.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/xuginipigegoxenulimigos.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c888bf8d602---wubapalamifawibokep.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/60ed6bd0cd4d982eee01bdcfad913e85/61031309614.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084033040c63---nakis.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/5068810298.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/nisokutozetudevafevewu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/58692a3611f917169abfe65d064fc5b3/46685939117.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160859da68fa0e---fufagugo.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-23/20210623023407875775.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/92b11e5230ab51c91776488da87be63c/72227042871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=complete+works+of+shakespeare+abridged+pdfPDF 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_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 18060 bytes
SHA-256: 3b9eb84b745ed965fa4ffaa18cf22c3d28a21566f1af58264247f14d3152d5a6
font_01_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C68 11192 bytes
SHA-256: 3219a987fb4ac8f770bea29dba229614343a1312d5c1fd62aa36dda327aa3935