Malicious PDF — malware analysis report

Static analysis result for SHA-256 823ed7eb08002346…

MALICIOUS

PDF

90.0 KB Created: 2021-08-07 02:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e4c2eda22ac73f1a1ab60cb0d463e7a SHA-1: 7f658a3bb278aa1685893c52865a33de482f9b4f SHA-256: 823ed7eb08002346b009daa50b6376642966145104d00736be85cdc8ef3ba6a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of embedded URLs suggests an attempt to lure users to malicious content or phishing pages.

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://queure.ru/uplcv?utm_term=max+born+fisica+atomica+pdf PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4fa646e44bf35aa8b614ac786f1f4e75/ledunukixijegopepamadajud.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/88029073403.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/disawezetobeda.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/kiviwabodugeb.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729ba6d6890---63200306950.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/55283459645.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/69131244778.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3568365e4f---49636182770.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/59019594430.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b9148b533---rugozowiboxevovulab.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091651426c38---nerubolokekivikobe.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/76163793264.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/94909057667.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/72c14ee4ac1e234a4031f4065c02f562/norepob.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210708215356.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/xolixuxinenuralavusupe.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c88f0a564---pogepoj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0ae9ca36b---28790156819.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/waweganikaxerisirikutid.pdfIn PDF document text
    • https://blokhol.com/upload/files/zitamanilozogekunub.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/52702981519.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/f1p83djjv07m603n8tapvvojrh/zetiwidoxuno.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a04cc52212---7625343804.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160717b6b929bf---31526557782.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_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 22328 bytes
SHA-256: 78ecf23eeb0bfbb709389951d339c478985e9500dbeba436b9ac12d4c3c272a6
font_01_sfnt_off000127da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF1 10836 bytes
SHA-256: 3fde591b1140122abc9e3d7d3f966752b2ef67b9bcaf0a955a9399b6d71c5dbf

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