Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bd3ff3ca216582…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 23:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 796ba992fbcf3a57b9860b5fb2d74283 SHA-1: c4a7309cbceacf8da6718efa95d8c1a32427aa8d SHA-256: 16bd3ff3ca21658268a2fbe4d08dc3dc04bbcebfacdcbf938c48b6756db76b97
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised websites, including WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links to potentially compromised or disposable domains supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://tdfstore.it/file/21965719075.pdf In PDF document text
    • http://naosgym.com/userfiles/files/96684192731.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/gavedasovekirilak.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145122dbe89e---badinopeko.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9abb9273---kitizumuteza.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/kerezijoroberedezef.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614461ec32d35---73456066323.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/gukirasanazilitenizabosow.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/rarejudivesev.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210918190929.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/43655109720.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/49757172123.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/kuxijoxejaxezinidejasava.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/75741536770.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/48887389188.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/28233305983.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613228f5cec13---dewojojimuninoriligoga.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/debalope.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/98750185229.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/75875527365.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c37bcb9c1e---48799918795.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/93686829182.pdfIn PDF document text
    • http://djpress.pl/Image/files/laziferugebedup.pdfIn PDF document text
    • https://techlan.pl/files/file/7534350642.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/figonasabepafuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=vlc+iptv+android+apkPDF 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_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 10332 bytes
SHA-256: 5924cc0ca16e5f43796763e8c4c1dbb59b0f484b4dfc6d6412ce368ef82a7d3b
font_01_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 20084 bytes
SHA-256: 384c45abb03c36abbab5c9e00ecba1aa9eafcd5c47e1cd001ae8587fb9a3fe81

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