Malicious PDF — malware analysis report

Static analysis result for SHA-256 9777e099ca2ba82c…

MALICIOUS

PDF

73.2 KB Created: 2021-09-28 02:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 374fa071a58fdbc63cbd6f07bf3d2130 SHA-1: 172073d56ccdcb7f817f32f5c1c5b7547a873590 SHA-256: 9777e099ca2ba82cfddb9efd5a3f076dd328e92333ff32f50841dbf870d41b42
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that lead to external sites, some of which are hosted on compromised WordPress installations. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://merklink.nl/site/data/ws/files/14018482193.pdf In PDF document text
    • http://trustarshida.co/cache/fck_files/file/5638846556.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/30210548156.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36204028e---dezovuwuleno.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/gunitabolole.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/guwuvegakanamu.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/minibopanum.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/59881897973.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/diwapuwujefunuzotajizej.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/zudojos.pdfIn PDF document text
    • https://eternalbliss.net/file/zaviwiluvufukig.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/49951682177.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/dozeladikoboru.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2mm8orkjl0f749gtlufmv2q1g5/dexexasesarodobiviso.pdfIn PDF document text
    • https://miet.hu/kepek/22017937341.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/16121843973.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/vc3a3h0merlmb7hhh86mbpi4oh/31588398056.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/mefan.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/31877531890.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/16347229074.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/gilidumudinulinidebepus.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/lenovaviko.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/61746501016.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/xididovadusojimeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=borderlands+3+3+playerPDF 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_off0000b7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D3 18004 bytes
SHA-256: eed6dd26ac89e87248c2d7fba40818d8e051cb88bf0b4ea49fa6b70e5b5c8864
font_01_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 10536 bytes
SHA-256: 70ce64692cf44ab4fc3fd1e8fa165fca92cfeb6694ff7a403a45510264819c5e
font_02_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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