Malicious PDF — malware analysis report

Static analysis result for SHA-256 b259579f18f00162…

MALICIOUS

PDF

138.7 KB Created: 2021-07-03 08:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b617f145db7713fc6698274ac4608980 SHA-1: d634249d5821404cb79a28f0d59fbf3c329c7a27 SHA-256: b259579f18f001627d91d769db9bba142a853b1b017bdc96e3e6ac36e3fb409e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to further malicious content or phishing sites. The presence of links pointing to compromised CMS upload storage suggests an attempt to leverage legitimate but compromised infrastructure for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://pelesiuvalymas.lt/i/File/66332943877.pdf In PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7d409acce---vepafojoseribizorovajo.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/848bcb93d3161df2821bc66068343a41/pawenipovivo.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/wilunuwomelepegikebibir.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/27042179479.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/doxibubofuzi.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/sefemopafiwetidub.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/zopepelafofulazufon.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/19633326989.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ig12n10phccvkft76kbaj3avcu/fobukixoriseroreleg.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/vvuee2dev7q0s3bog0dldfe0ks/25516229881.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/2997e6973dda7a102f69f43d6d0b201f/85245452982.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/46493204103.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4d9d7e2a045e166ccf51301c470f1f02/xigulukojodufegogo.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/8abf2b753fb85eaafc4e2c8de84add09/bofum.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/99527603150.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/tudolawarejepa.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775e67c6e83---fuvebiso.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/fijigonuwozoramo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/fiwev.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607425a3edf3e---samoduzomofiw.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b777eeaa9---lofudugux.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e14c70a3ce214681e49969d161eda4f5/33103939026.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e89d73a514---lepiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=for+we+have+not+received+the+spirit+of+fearPDF 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_off0001be40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE40 17536 bytes
SHA-256: 3aa8dfb80f30f3b36af12be70c9ba10381e515572c7faa93daee0ae45ce7a012
font_01_sfnt_off0001ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBF1 10800 bytes
SHA-256: 9f212e4f9f9b3eb0577302aa901cd50f2b4c78bcd3c2079d2826c63bad3669a2
font_02_sfnt_off000204d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x204D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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