Malicious PDF — malware analysis report

Static analysis result for SHA-256 75846fbaef168315…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 16:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de6758c4bb91a7cb4edb3461a02c9d71 SHA-1: 957442581e1d7558d9fd41f1e64aef8eccf23791 SHA-256: 75846fbaef1683152160f4677b3ab7bc423a0e97ed987b4e5339b73206f4a5af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution attempt. The document contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to host malicious files. No scripts were extracted, but the presence of numerous URLs and the nature of the heuristics strongly suggest a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160812fdc21a66---49461578841.pdf In PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/84243315691.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/7dff32958a23d7a4deb5ab5489274d8a/jopovogatinin.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/povigikiwefavobono.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/db27e76acb654bb5f84c17b788e3ded0/84748607685.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cd86191b3d---pafazu.pdfIn PDF document text
    • https://j26clean.com/upload/files/62582215780.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/muzedexumadifaxivujekezol.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/73491528115.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/elrr5ksrmsog45834j4pulr6o5/90008199131.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/44322551206.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086be2361ee2---21877101993.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833580ee1c4---nisubi.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/witubozerebo.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/13766474137.pdfIn PDF document text
    • http://exima.kr/userData/board/file/kubil.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/56d4e6a0fbe61fa81e250f8e889a6fe6/42365439005.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/97723620513.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/wanoxo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72676f224---19471477639.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/taxukaxaremafib.pdfIn PDF document text
    • https://gangnampools.com/contents//files/bajosijizobipavadole.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/9780605381.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25979680c---99837110439.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/gaxipoxosedewedux.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/fepademoruzi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2dc880bdf---36161892551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=morningstar+equity+research+report+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_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 11208 bytes
SHA-256: 388d6e4372862691b8a365b8d7158774cec1d7cbee859d7491c1027daaadfee4
font_01_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 17244 bytes
SHA-256: 470a8c15f9833032d0606886ab5d327d4895e54710674208799c85de5af322d9
font_02_sfnt_off00011726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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