Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83a71b72500b03f…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 04:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cce56c9031d233a17ef4799bb1e42258 SHA-1: 8629ddc4e31eb9c2e206eded72990c21cd92027b SHA-256: b83a71b72500b03ffc0d9c8a1bcab365c64f7790333d74638a602b94ff90a8e9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially compromised websites or are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://hanboo.cn/Uploads/file/2021091222254370554.pdf In PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/63396489017.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/gigojezirozu.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/vupijubom.pdfIn PDF document text
    • https://tcremich.lu/files/files/35687676999.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/nifas.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/92669552644.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/98787957262.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/23195165591.pdfIn PDF document text
    • http://sivam.pl/files/file/xutokanuxuwifubapax.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/85190267352.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/02de1276130b6f87d9b4da3a128b33b4/33654998325.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/zerexubowuduwatanef.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613489f5e5340---66538973291.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/fovowumuvazamipaxewitu.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/tetefuwepowidikabezi.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/60713369624.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/27340416798.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/696b0328c8a729fce29e1c45ae95c1cb/93303408996.pdfIn PDF document text
    • https://harmony.im/userfiles/file/jinivakarojefexut.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/wapujovuripazuni.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/b6597d2f8209619ee66476af51257b90/1939055655.pdfIn PDF document text
    • http://e-district.org/userfiles/file/vagositajejunufolawobine.pdfIn PDF document text
    • https://masihpt1.com/contents/files/54654533105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=candy+crush+hack+apk+2020PDF 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_off0000aeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FD 14484 bytes
SHA-256: 1614e37e62c3f96f8bebb8288453798a8f7bc8fadabadad50c7c17f36d0631d1
font_02_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 10704 bytes
SHA-256: ad8385fdbf6ad051d37adcc8e9ddc0d63c3353baa3215062f5913b4c8d47e7a3