Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd2a39a5793981c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 11:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6d6bb2759f293c61141a0f45d008564 SHA-1: f32d92f1179d89b433ac584c423c7cab8e258df6 SHA-256: 5bd2a39a5793981cb930b2ad671177f4b2178c812791167e596456c391ec04a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to exploit users through phishing or by serving further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ihappywash.com/uploads/files/202109041033577310.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16150175420431---raten.pdfIn PDF document text
    • http://fohow77.ru/upload/file/futewulexo.pdfIn PDF document text
    • http://hflchw.com/upload/file/lotiporumobizexefofugo.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/kiwowiwotuguwulatuxiv.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/jexovu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb93ace122---43780568717.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/42139991347.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5cee85a5d---bujivumijamefikomulokavu.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/86756375865.pdfIn PDF document text
    • http://sieuthibds.net/images/files/niselimegikegulegugejizuj.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144736e061b0---17300430707.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/livujofodux.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/semilesudoluvegafirari.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/gutolakuxabomonakavusi.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/fibovubosuzobegiwarazepup.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/ralupaza.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/65843841132.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/xerodixoge.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/30204970424.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109181925576683.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/mezebotozid.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/63377573669.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sibonuvifafarifamekot.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/jerubovese.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/17571120464.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/porumudatixiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=3d+surround+music+player+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_off0000b7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A5 10960 bytes
SHA-256: ec48fa875bf310ed0e13d4c6d6b12ff7a8f7d8750cd48adf52ff56e83f8f5113
font_01_sfnt_off0000d108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 16360 bytes
SHA-256: aa113eda4f15bb852002beef9b559122e6e5921c94da15c8bbc7feef2ded1cc5

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