Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5f52815464d6f7…

MALICIOUS

PDF

88.0 KB Created: 2021-09-21 00:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24f503c65ebae2e50a7edd5e2491dc10 SHA-1: d040204f5daa94b4456140a16078a5c4c2ff5bff SHA-256: ae5f52815464d6f796469db74021649d5f36cab42d1abf6cf6b2507a5e73c57c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. This suggests the PDF is used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://marthomaktrplrdiocese.org/ckfinder/userfiles/files/46324832174.pdf In PDF document text
    • http://mdtrend.hu/files/file/39255262635.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/xowemijipit.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/90980908480.pdfIn PDF document text
    • http://52963566.com/upload/file/202109171655151347.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/88950782590.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/rumagezifuvafuvazafedig.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/kapuwakaputunawujivi.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613702d696cff---pokinides.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16147d80235d29---25964050511.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/3087367906.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/vorirat.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/57702629601.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e9d799e9c0dc92a3533717d79a5a81f5/xaboxe.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/20784177906.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/munawo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/55be2dacab3729bcb9fe556f91f788b0/kipimagu.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/96518040387.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/30543783593.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/92014837511.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/21072784055.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/51369632962.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/mv8ubgqdq2v33tpjf0otntrqd3/xomovebavabojegagiwugut.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/jemisapuxiguwe.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/37706601146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=kotlin+alarm+clockPDF 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_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 21044 bytes
SHA-256: d9c4df932d279da8800b24508f410bd835e9ef42c092f4bca3db4a373718c93f
font_01_sfnt_off0001237a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B91 10172 bytes
SHA-256: 33b8001f4dc4c779e05b1cfaa778f71846af628f09060fa20f78a0e0ede55e94