Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77a15fe4678d6e3…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 22:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cef4f12644fdb026a22725578cff4cbb SHA-1: 1940ddf825caf71428022ecaf759d3f0497f5ccb SHA-256: e77a15fe4678d6e3e4d33559738500f6eb25087ec87d26adc86c5c6ea74e9c2b
156 Risk Score

Malware Insights

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

This PDF file was identified 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 compromised websites and potentially disposable hosting. The primary purpose appears to be directing users to malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7d328113053cac7a7bf6e7c497e9b687/77305066567.pdf In PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/dunijobamogunolasibow.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161304369ead8b---labaxulafagidezizimeno.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/zumevisosi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/67db872a2b1e08c8f6023c72d98e451b/67032525380.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/54389953209.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/gevalezonagixoridix.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b67f4f3fd---zujeguxenopivunikuvupeg.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/93c072354124018e2b0221b15e412735/28618461398.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/24526070733.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/sajejelokapu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f280b48e1c---8028301034.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/75471258990.pdfIn PDF document text
    • http://byecook.com/ckupload/files/34581642406.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/97071152754.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/94319399386.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/tinivamezug.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/78806963483.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/97053235360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+boot+macbook+air+into+recovery+modePDF 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_off0000aee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FA 17116 bytes
SHA-256: 1cbd7c50b22fcc5da2d3aaacf7e5fffd301ab0bb7e7e91329b963a9f9ad92ab4
font_02_sfnt_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 10808 bytes
SHA-256: 8a747b8adbee03dcdac54fa282fe1cb1c8b12529447a79a94c4f33505b4516e9