Malicious PDF — malware analysis report

Static analysis result for SHA-256 7111ac17fa6698f3…

MALICIOUS

PDF

71.6 KB Created: 2021-09-28 21:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b184e42be27cf7525dd920d30a9a3026 SHA-1: 5e811ee7d312735a5c435972c3ea96b9e0dca868 SHA-256: 7111ac17fa6698f3ec865597d0b78f1c1a029cb68540ff460c0360486c547973
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the document structure and URLs point towards a common tactic of using link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://pixomot.ru/uplcv?utm_term=best+rpg+for+android+phone PDF link annotation
    • https://perfecthospital.org/FCKeditor/file/vikeruzamujewizunakad.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///rifawetalaka.pdfIn PDF document text
    • https://emenu.hu/editor_up/batogokesaledumesuxabi.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/99f63fd01f7be70362ed01320fc05a0a/23870762971.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/5cbe8f90117c6b41011cd02f562b9366/72112509820.pdfIn PDF document text
    • http://millecolori.it/images/file/18393212484.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/mivolipe.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///kagumugititupakalizi.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d484c20eccfece2d873553f815758525/buwalowaberepoma.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/60000121505.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/tifinedazivifutosedekoluk.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16143210a8e18b---57252289743.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/revifisipipevakobuse.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/62098830619.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210911044913.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd2cda44a2---96122299942.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed9368ea65---doxefebesu.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/16168918306.pdfIn PDF document text
    • http://alvitraders.com/files/vopuwiwaba.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/takunulanakunexi.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/52388978839.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/mogigorokugif.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/58709713656.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/wotoguzinunotegexubi.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210907_1E1D6F9CB72A3946.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/jikawitumupugudibonili.pdfIn PDF document text
    • http://888chji.com/userfiles/files/8462076109.pdfIn PDF document text
    • http://derivat.sk/files/49679776742.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_off0000b77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77D 10784 bytes
SHA-256: 51c06d11b69bf4e1cb19f70f84bdece3e8ae00c47e3f0333b345e4aa849d15b4
font_01_sfnt_off0000d016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD016 15996 bytes
SHA-256: 1e1069972ffe6e1526579a1c2ea8a576cb052a8fcf81d7061682b213213f7026
font_02_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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