Malicious PDF — malware analysis report

Static analysis result for SHA-256 96be8ba87b1e6482…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 03:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d7c4acf0c3d38b0b2c2bbff03b64968e SHA-1: c38fb2dbe7c8cca9c3c0ca5963285d4e7d68fc70 SHA-256: 96be8ba87b1e648229a175a122e7f281fd0fcd34caafca8bd86b08b454a94435
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://intersonik.eu/upload/files/74746234575.pdf In PDF document text
    • https://mytekas.com/UserFiles/file/xusilagubenoxexo.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/wopom.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161419afe17d60---fenigurukusizeg.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202191775405633.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/fajozasa.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/70549914471.pdfIn PDF document text
    • http://lactopad.com/uploads/files/94401794983.pdfIn PDF document text
    • https://binhvi.com/upload/files/munelujopuso.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4af822ef25e82c37c209229f6c352f7b/66478015273.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/44291415174.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130a71e11395---ramijegotibudunaveburiv.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/votikalele.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/74793886928.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/80163117492.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/wogofox.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/jikazuraxiwuwu.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/famepubesanozosu.pdfIn PDF document text
    • https://kawanmto.info/contents/files/maguduvabajutixewolidap.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/wadivuvuwux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=i+think+so+meaning+in+malayalamPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/mawekitifuwixut.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_off0000c3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AB 20936 bytes
SHA-256: 5e84daf42074f61d4bd1df517274aefa16b42ed5c9237b275575a0ee210a8e2f
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 10612 bytes
SHA-256: 5e54c11118f01eb28ef7e37b07d4c96f11a952aee1d0ec9bb3c2e9db8f584e52