Malicious PDF — malware analysis report

Static analysis result for SHA-256 1960666fdd295108…

MALICIOUS

PDF

76.9 KB Created: 2021-09-14 10:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d71e27280b1bc2ae1d2050fe8ef94c20 SHA-1: 9036a4c3d3de7eea08c8c77f2864aef35a11d055 SHA-256: 1960666fdd2951088e66e122499ac73eba54396612d2f5761589203c9b3d0e1c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

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 https://philabc.ru/uplcv?utm_term=words+that+start+with+a+and+end+in+z PDF link annotation
    • http://beamstraffic.ae/amb/userfiles/file/59500315286.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/kisojitefatidexigosoxomex.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/61194748436.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/vupexubebu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613206a3e9c27---derozijiniletevibojas.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/lajazi.pdfIn PDF document text
    • https://mar3ol.com/Files/files/70318378398.pdfIn PDF document text
    • https://duel.pl/userfiles/file/66164712118.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zesogafekipojigipevok.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/pewexonugopupusunoruta.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/77604106229.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/suzojutomosubolo.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/wubujimekinu.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/vigulij.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/53784636781.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324dc676bf5---45583154670.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7mpd9l6666ffmoug25pe63afos/12149672993.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/45065454524.pdfIn PDF document text
    • http://wjcopy.com/upload/files/49670828660.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/48672213493.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/46692957343.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/68801006352.pdfIn PDF document text
    • http://speckrepej.com/upload/file/67813438657.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/33930555045.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/1e66a3ed67c91bdd18d96a7deac10db8/boponuk.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_off0000ca85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 16744 bytes
SHA-256: 5cf3181096c97d980363df56ef697f601a0e39ab0f58856e35651b5a475f1476
font_02_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 10436 bytes
SHA-256: 6700d87cd0bf28fcfb135681a9975df9c79057c94b64451d310e008beb026f96

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