Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e34ccaeb51ea06…

MALICIOUS

PDF

74.2 KB Created: 2021-10-02 12:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ea35741b2afd51c30eb4f701462464e2 SHA-1: c14816c9ad12b7ba0ae3ab0572e480afeabc3542 SHA-256: e5e34ccaeb51ea061bd66b265de0225725df89794551f00355288eb7fff50a41
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URIs and is described as a link farm, with several URLs pointing to disposable hosting or potentially compromised sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristics strongly suggest a malicious intent to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=physical+therapy+for+ac+joint+separation PDF link annotation
    • https://global-brand.net/userfiles/files/47763596865.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/doxunexaw.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/19202599962.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/82222953144.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/92921296350.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/buwomosatelolapuz.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210929144417.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/zigogapebekadodujafiwowe.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/jimesevilupobazalobepelin.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/1861854380.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/77241025345.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/85532078203.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/lozajavevepuvivaki.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8de0e44b06ede8f6250e301a73a54508/bekaj.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad0b6aeee77e54de80f9affd1e44e2cf/22317490223.pdfIn PDF document text
    • https://mauspro.net/upload/files/pazabaloxafakaba.pdfIn PDF document text
    • http://knipia.com/userfiles/file/bojilajatotufo.pdfIn PDF document text
    • http://skia22.ru/pic/file/rosuzotus.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/51415801436.pdfIn PDF document text
    • http://bubb.cn/up_file/file/70982686927.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/930929471.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/50492890240.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/wopabepebe.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d1ff3657c---tetikimitisisori.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_off0000bbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD5 10824 bytes
SHA-256: 14f3e20063f344ddb5aadce0625981376a45fe61c8e338ccdd935d25ad148937
font_01_sfnt_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 18220 bytes
SHA-256: 60ee077b0a7e4a49f6415fa27cdbac61e9673147199bbe4f539ad0a92ce2d8b0

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