Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd9faa014bbcf9e…

MALICIOUS

PDF

93.8 KB Created: 2021-09-04 04:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e13967c80a0cccb5764221b829bf15d SHA-1: 117373d78a9d3ba8c78a11a78c12c8158cd1a9f5 SHA-256: 1dd9faa014bbcf9e217ac925674d7068242f2b5aaad8c9dec865c2010a560b19
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate the document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs, such as http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b216f4c10f9---29849890664.pdf, are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfacabdf89a---rajuxidipawubidumagefa.pdf In PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ab3dbe1a1d8664682bc5be857d77a5b0/damokusogitikofabokalu.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/59920631467.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf5a05af5---wolijuxagabilarijaza.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/2286381cbdf5b7f714d255e0fa7cc64d/tetujixujenedu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b216f4c10f9---29849890664.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/guwurazupenevamuxawomura.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2775bec75d6516f2d175c5e210145921/naxiledos.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/26763655518.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/42370814704.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48222813778.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/silamemokawetipuno.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/gejuxunetomakefav.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/3k97p1clb93d801kkns057gihh/87960848249.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/33929400261.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/rosenower.pdfIn PDF document text
    • https://funbugs.ie/files/file/81206291382.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/lafoxebarutil.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be5d392c5cf---11314196797.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/29pd6027hn53cdigse34v9t78d/13811082498.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1a51cfdd5---25974563238.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/xekutoxup.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8itrbkrr9tj67cjc9a88r2vkuu/83800525208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=nursing+management+of+sickle+cell+disease-pdfPDF link annotation
    • 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_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 11164 bytes
SHA-256: 5b73d0d4b70f5b1b803ba0245742e7571b7b60b6ddd6d16f1ae1885f46904640
font_01_sfnt_off000121bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CF 18480 bytes
SHA-256: 7a4115be83eed8c84ab603f1a8162ca91b07f207eac15cbc58c081ef93cf840a

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