Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf10288937fb52db…

MALICIOUS

PDF

96.6 KB Created: 2021-06-26 05:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 091c22ffe7092d10f564f04eadf7abb7 SHA-1: 12c8d0a0332157143546382e397729e5edaadfa6 SHA-256: bf10288937fb52db78f786906e33d99ba67a8c7c632bbd2b695aeeb4eae953f4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting sites. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://queure.ru/uplcv?utm_term=am+income+life PDF link annotation
    • https://latework.cz/soubory/12151847725.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/vobeji.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/36399496307.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ttgr4ltldt7ugfmv3ofakm7ufi/jeredoka.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc47fc16f6a---76967166064.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/40352330906.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/93f57de0a774b3c20ed0ac1ed4e50f11/28742113193.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/49735096387.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4bd46ac5d---bibojebi.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/selimaxobimurut.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/e46bed3c1ccbb48bdc2ccad9b90e99b9/88097988020.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608781a3235dd---7279253630.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6bd4e0ea0---zikexubosuwu.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/bositunemoxovekev.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec2c8b75f---73412622878.pdfIn PDF document text
    • https://isleo.com/i_photos/file/bowimubasuvoturi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/63791714622.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/49401088562.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7b2036c7---kubomekewutasida.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sn739nldjhs9kvtefn3pg1fa43/teredusex.pdfIn PDF document text
    • http://www.asslar.de/downloads/dorilisumiwixi.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/cf9a8704a2355f854bf8084d312339ed/77624008680.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/lubumivisojasaxagaziravu.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/70307948589.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/fiwokivafotawe.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/2916188294.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608300d9e8b77---paposenazavebotujarag.pdfIn PDF document text
    • 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_off0001181d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 9948 bytes
SHA-256: e2a8ae07e2f52b7d4557465e8378ca587efdf3f8b0b46847d9e8fccafef09e1d
font_01_sfnt_off00012e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E01 17936 bytes
SHA-256: ba9df47ae91aab5d0595fb61fd853cb0d34ce7e88b4efeea58a8094904e4a9b4
font_02_sfnt_off00015d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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