Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d18141cdc1d78a…

MALICIOUS

PDF

70.9 KB Created: 2021-10-01 06:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4f5bf4fa7c42c7f4803ebc6814a1ee37 SHA-1: 25086c146b50a0dd00dc98cff1d1e75f43bb4d0d SHA-256: 66d18141cdc1d78aa0c41e976c14add0bc391cb927230e6caeb2511f611096cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or are hosted on disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior. While no scripts were extracted, the primary attack pattern appears to be social engineering via a link farm, likely leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://crysiq.ru/uplcv?utm_term=how+to+use+adblock+in+chrome+android PDF link annotation
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/virajozideneg.pdfIn PDF document text
    • http://domplus.su/userfiles/files/10169474062.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/juwepekenizi.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/90859068782.pdfIn PDF document text
    • http://alkanboya.com/files/file///petolubugimeli.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/acen5o6b8m0o9asj5sjsq2vdsu/76191165493.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/pujuvanajisivalaj.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/55882442550.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/6703827547.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/2318186869.pdfIn PDF document text
    • https://ms2oke.com/contents/files/poziparor.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/dawokirezegatakelukemiw.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/kakokusujukokafejipokepeg.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/reguzarizemunopul.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/21879318404.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/42043078988.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/vurizolanuturijevamute.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/41269918699.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/97654922042.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/jewoxibovenuzuleb.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/21550241480.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/fc0317c5ccd12eba5b534a3c0404fd9c/25709713238.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/puvaditujuninirerijobaw.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/pimodovi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae9b8868b5---42455388707.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/64132415933.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_off0000b29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29C 16364 bytes
SHA-256: a1932e11d9a81d6e57f81f62cf411d95a79c1aa79f1dbad0346c031c6329227c
font_01_sfnt_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 11044 bytes
SHA-256: c097516dbedea70ffbfd160c1fe957f04a707e5d349d934c75d5dcf7810415c7

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