Malicious PDF — malware analysis report

Static analysis result for SHA-256 15498bdcf9555576…

MALICIOUS

PDF

76.8 KB Created: 2021-09-02 14:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 823207b05dd7d2d6bb181cc00d17667f SHA-1: 020886caf00cc62645e7f78f6da6e8594b69915b SHA-256: 15498bdcf95555760105454b36e22d1f557664a159320dc7a5b2017eb5a56fde
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. The document contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple unknown URLs indicates a likely attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e0d4a40d3a4b92677817535ff40f41de/14360885191.pdf In PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/98496972906.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/subamunibiwoxufinelonod.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/ligabejogexep.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/8276666652.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ace8f380c2c---98810959009.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/4000483081.pdfIn PDF document text
    • http://mantyobras.com/userfiles/file/memajuveredajijeba.pdfIn PDF document text
    • https://peterdegendt.be/file/75958062883.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/87ba506bbc08a160a26e0cad70d3cc06/jazifafuri.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/fuzonak.pdfIn PDF document text
    • http://kleiberit.ru/files/file/45332788620.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/b82401de1691820fc271f887827fb6f9/91833102888.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/7b57091cd51df87cf8ba18ca70bb4bd8/64096960500.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c87bb1c931---93889396971.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/sufisipemilanox.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/72141065063.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160af773367675---viwerelexokeligakizupexad.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1072ddbf02---32922255514.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/juxodas.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/89462425709.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/6fef7844560e09694c6914ed8842a8c1/90914192557.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6dbd0d5c46ca1269f87a98c8ea87f124/zegiwevajosefetuwawifa.pdfIn PDF document text
    • http://devveb.net/userfiles/file/lasisekuxugedud.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/36912247571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=belling+range+cooker+manualPDF 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_off0000c6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FA 10552 bytes
SHA-256: 8d68f1da012ce3410bdd65ea069f94b876410fff6ec3a2dba1a15ccaba2be5b2
font_01_sfnt_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 18128 bytes
SHA-256: bd85d2f2037a3a7f6b5fe9ee99ba43032eef6358703cd3a1756ac876c935c214
font_02_sfnt_off00010dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1