Malicious PDF — malware analysis report

Static analysis result for SHA-256 7375bd23c4ab67ae…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 09:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30bf2f1ad65fae29831b9727e3c437d7 SHA-1: eae1db45863ae6131a61bd1c1353d35c4b218d5d SHA-256: 7375bd23c4ab67aef4a3415c01997b2d0fe2a15d7e10b379c1dbbf3da9f2dc40
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. Some of these links are associated with disposable hosting, suggesting an attempt to obscure the ultimate destination or evade detection. The presence of a download button lure further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jtg-antracyt.pl/files/file/sonibudiwaziretofod.pdf In PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/36089977902.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/70789700646.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/zazabumoner.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/50555336106.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f0e0003dd9e958b2c256d06c606a3be3/fozode.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/kezojev.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/rukarunebavov.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/wafaxupaginixodidobag.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426553909f2---tepenusipazopofetuvizuno.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/badagasopeviv.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/dovaloxupagedepome.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/kowotexowupuw.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/turokodovarur.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/sofikapowemilo.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/8632309089.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/40923855053.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137b56da9a9d---29855110421.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/69321192660.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/jamofofadirewilipogaka.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/jiwuponovivobebuverado.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/gijut.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161339a85dfe0c---3377599224.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/lapetuxojamunaw.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/koretuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+app+to+listen+music+offlinePDF 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_off0000dc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 17872 bytes
SHA-256: 6b3e2010356032dbdf9c1d1f83b9702f44afe72323631c1aa1cd85bea0a5bae5
font_01_sfnt_off00010ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 10696 bytes
SHA-256: 3f7b78a6b78efb912f1040c2a8165e41613427384d24a932c6f51eddb8c88b1e

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