Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec34eff1c7a399df…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 03:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 607a283e9b88962a7f2228e1ead44af1 SHA-1: 42b715eac4c8a9fddd3554b07159be3a0c359263 SHA-256: ec34eff1c7a399df914002942d3d61a4df98824be15f0414fd6437c5f60e0417
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting. The embedded URLs likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

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=iphone+12+vs+samsung+galaxy+note+20+ultra PDF link annotation
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7264655d8---38152016342.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/pevami.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/vavom.pdfIn PDF document text
    • https://halkum.rs/files/66257785439.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/82461976257.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/nulofisejorodi.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/zelitizepazewobibose.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/86459939049.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/pivapanexuri.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/92975178006.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/1859226863.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/xuxuwopanapujo.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/396528620d3ce0ae609383356dc6dcc6/75973548349.pdfIn PDF document text
    • https://qnzar.com/files/renikuluravefuzume.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/6476721565.pdfIn PDF document text
    • http://vaithun.net/upload/files/tituwunitujulalirunivexe.pdfIn PDF document text
    • http://airsoft1.ro/files/file/41182963609.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/liwunesavuveborimurakopap.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/706fbdb67a3fba33cf02624de73d84e8/19609600622.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/21730721215.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/ripibosixon.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/71341982882.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_off0000b908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB908 17176 bytes
SHA-256: c741d53a7c6ae01bd3b503f6ac0043dc5666612ba01aad63e2bfcce9710fd498
font_01_sfnt_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 11236 bytes
SHA-256: e679c3b96b19c57ff11eb241d6320fa0f30ebbba7580dd42ca289e5147300a55
font_02_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1