Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c79eb9300cce7a2…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 12:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9b83fbc70a5ed2bbfc6f7da07450e6e SHA-1: c532837e52a41d7d613a4110a65d392f225f4466 SHA-256: 8c79eb9300cce7a2d83d8ed3ed07c07eeb2d36a03065b7b5b952ed4e2615b82f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to various external PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics (compromised CMS upload link farm, SEO disposable link farm) strongly suggest an attempt to redirect users to malicious content.

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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4gvqqg50qbni81l1f1tfmvt2f6/55427514349.pdf In PDF document text
    • https://partetesal.ir/data/file/velevinizemogowovemuvijog.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/62567820154.pdfIn PDF document text
    • http://wych123.com/upload/files/lowaxesufadosopo.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/63237776905.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f864137a8---16397511026.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/rixoku.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/mobikunofomufagosatanag.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/62099985246.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/bunefososurodu.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/zabezepasinag.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/nifisituwogamujitirodu.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/43913574298.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tafik.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/63997323023.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/tuxerubosubidobivu.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/55714937906.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/47093039120.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/55127030857.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/pixubamigolemige.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161302a4a52bc7---79159619073.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gidujivadoxofojoko.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xiwaxuzidoletinadi.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/3967315051.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/61228332983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+video+merger+app+for+androidPDF 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_off0000bda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA6 10912 bytes
SHA-256: 325bf8fd0ae4ba8d406d7d17db0e077d55701b2f72c5a827554ede45e6756e73
font_01_sfnt_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 16596 bytes
SHA-256: 68fc235866eb59d55ef22b5b0ae2ec9037b24d9144e8a3d18269af5505a46219
font_02_sfnt_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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