Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8817c9098796965…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 04:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 459bab113c7268af9d4e416933cfae9f SHA-1: bfe8a6ad59c25a2fd685e4207d0de4faaa91fbee SHA-256: e8817c9098796965c9c8b067e3bc935f700528899eea89d54b5ad67e2134ad8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ketchas.ru/uplcv?utm_term=sonic+runners+revival+download
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6a073a294b9c4bf5f6ee1e9df6387115/pudubok.pdf
    • http://huarui-bio.com/upload/files/selinagedalelon.pdf
    • http://sun-green.eu/ckfinder/userfiles/files/87377837281.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdd89c0d62---90719957735.pdf
    • http://apluskleaning.com/admin/images/file/56825571204.pdf
    • https://anesaportugal.org/upload/file/fanumumugagiwepux.pdf
    • http://smenergy.kr/uploaded/file/6017983386137e091ae8f2.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3b633423d7f0fcc0268001dae8e60a41/59758300846.pdf
    • https://vili-al.com/uploads/wysiwyg/files/47119307077.pdf
    • http://levne-pohary.cz/UserFiles/File/30056608637.pdf
    • http://iraneto.com/basefile/iranetocom/files/25948633934.pdf
    • http://www.bash.cl/media/file/55522391107.pdf
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/94370555537.pdf
    • http://vektor-bezpeki.com/userfiles/files/tiguxos.pdf
    • http://clinicaveterinariagussago.com/userfiles/files/23774986937.pdf
    • https://granitnet.hu/editor_up/85980248652.pdf
    • http://syarmarka.ru/userfiles/files/49372545508.pdf
    • http://wlpp.net/images/blog/file/wewesoforuva.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210912_60D004679DC31CD5.pdf
    • http://clickvay.com/upload/files/37720316701.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_off0000c562.bin
9b7ac9880b801c1f5e7f7d839bb1197842a3a45d4fdd28ca4c4aaff11ace7f26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC562 10592 bytes
font_01_sfnt_off0000ddb1.bin
4506892d762328216860632cc83ca3b70baca730f96d006c9b78d951ed05d933		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 17868 bytes
font_02_sfnt_off00010bd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 16792 bytes

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