Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b9da7287acbf3a…

MALICIOUS

PDF

69.0 KB Created: 2021-09-19 17:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 590bfe02270e2756db19e132b31e69e7 SHA-1: 92c3f252a683640deee7294ab9c25fbdbff6fdc4 SHA-256: 95b9da7287acbf3a364b2090239b199e2a5fa93363e4019e21d4603d176e7c81
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm on compromised WordPress upload storage and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://crysiq.ru/uplcv?utm_term=how+to+delete+sms+messages+on+android
    • http://z-sinpro.com/upload/files/72172956154.pdf
    • http://maslatalaia.com/userfiles/file/51330619488.pdf
    • http://cpghollywood.com/userfiles/files/kidolabepiniroxaj.pdf
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210905064250.pdf
    • http://sbs-group.co/userfiles/files/1185358704.pdf
    • http://axwelindia.com/uploads/68836119099.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/12641147796.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/79361499248.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/5u5u6rmuo301gssqt3j8h72vf4/96880482166.pdf
    • https://consultemergingmarkets.cubsindia.com/files/xoxagojuxodowemobapavu.pdf
    • https://autoroman-service.ro/imagini_ws/83497289203.pdf
    • https://tybistanbul.org/resimler/files/28272086239.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0ca6fac85df371535b6c77c48bbb4723/bifeweridojemoze.pdf
    • http://csc0516.com/userfiles/file/20210908014731_vsigax.pdf
    • http://abwninemile.com/uploads/files/defuf.pdf
    • http://aaaexpressheating.com/userfiles/file/28052702343.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/bitokun.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b50a02d04e0a710cef39ddbf6c0fee08/70451894657.pdf
    • https://upbfassadenbau.com/upload/file/4235526171.pdf
    • http://exima.kr/userData/board/file/21116721090.pdf
    • http://fosterfreezesantarosa.com/uploads/files/wukawizukusugon.pdf
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/rapopikudegojelose.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af09.bin
f6e9f0d59efed5c0446817a339ca2bcb25a2243c42e57c5d2fb9bccfa5f27d37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF09 15292 bytes
font_01_sfnt_off0000d611.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 16792 bytes
font_02_sfnt_off0000ee28.bin
37950f574ca5c5360c480f0d2e3f2aeb33c1785aa7daf4ae4a1d7e7410c4e611		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 10668 bytes

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