Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e6f43060e23c85…

MALICIOUS

PDF

95.4 KB Created: 2021-09-07 10:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 810c99791fcae745c7ba8563d26f0e12 SHA-1: f8b701e4b56fcc02a2af91efc5c8e5a83d128e0a SHA-256: b7e6f43060e23c8565701de15df6e226cd91c34c2123d1dba70a0e0e102f0c4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF exhibits characteristics of a phishing lure, leveraging a link farm hosted on compromised CMS sites to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, including those pointing to compromised WordPress uploads and disposable hosting, suggests an attempt to distribute further malicious payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=simple+resume+format+pdf+download+for+experienced PDF link annotation
    • http://strandedtattoo.net/file/99760954897.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/xafekixilamuz.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ab7131e3d---pefaledupigazagelofulot.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/delubinuboganazufitu.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/34737636011.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e664ecffe---kuvaze.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/84858329063.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/jazurolizepux.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/demotifadalisara.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/35954343190.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/barexejudavupon.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/rakixomezigunilad.pdfIn PDF document text
    • http://healthywithhart.com/res/file/7394627826.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/ac6c5898d40a0db339f85f50a0f44993/43965361414.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6651e5ad41ee27640b7b7ec2c58ff1a1/modij.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/vemuwixepisegutazuwo.pdfIn PDF document text
    • https://digireg.dk/upload/werujopikinufarore.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/gefexesixofijiwazubufeliz.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611038a498d66---71212989724.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1393163af9---15896800750.pdfIn PDF document text
    • http://unityproductions.com/upload/files/fefaxireduwirokupelurilo.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/r09d9s2dm8jsnbdlt5otk2mq1m/95226066228.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/81306227383.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_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 11144 bytes
SHA-256: 0f072da0aab20c00b73a7b1d56b1dc4aec5d950cb49c3c884a7266ef1276440a
font_01_sfnt_off0001287d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001408f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408F 18308 bytes
SHA-256: f4603637751315012dff8c5762a4bae01ef97ee1d7c92a0288514fbd6da1efb9

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