Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fee593457c69fb8…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 18:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 075e24cb9e4d829e3bc40ca426930ee8 SHA-1: b3a69ac72daa3efa3ddaa6f0f535c35cbed15463 SHA-256: 4fee593457c69fb8ed9c2e26b9f7e2068ff9c6383ecae9aaa9f10c71f498b930
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware. The document body was unreadable, but the heuristics and URLs clearly show a pattern of link farming and potential phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=wps+available+hack PDF link annotation
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7jkrt4ctpvlt2c8tokdlu2n2a9/fasixageb.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/35694285942.pdfIn PDF document text
    • http://104408017.linker.tw/files/linulutobowasagedusebefo.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/75758015339.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/4564131903.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/17391347445.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/37002644592.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f88d9b4f19---79698597874.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/76882685117.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/nabafametemiji.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/mowexomadipukudakokeju.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/10640230801.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/zonelopafamiw.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134e408280e5---xorifiruxox.pdfIn PDF document text
    • http://royalgroup.at/tmp/35653784758.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/40259145258.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/mujomefobabuboxubakoxomef.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/56917165008.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/62031140493.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/30513426759.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/sorajogovarowobaxanemarun.pdfIn PDF document text
    • http://shesob.com/file/files/57767906887.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_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 10340 bytes
SHA-256: caf6602330245f823426756d75b56917302afcf9f2cd839ac958274bd2ea0779
font_01_sfnt_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 17536 bytes
SHA-256: 4cdf8c7c564e3dc425b62bfe5c54d78bd87a21ea596715c90b167e173166b6f8
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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