Malicious PDF — malware analysis report

Static analysis result for SHA-256 0279b39974fa5deb…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 08:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 857c54374a2838abc4e7eb9dded77c65 SHA-1: 77d0254f174652a5d4a6e20341c9e3634898081e SHA-256: 0279b39974fa5debb97c96785062ff9e6bab0d6abd20c42efa0786ad9469b4b5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the PDF structure strongly indicate an attempt to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://loyd.rs/images/file/48661059017.pdf In PDF document text
    • http://blankheich.de/images/uploads/file/92277301929.pdfIn PDF document text
    • https://aksusu.com/upload/files/pugubage.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dff9c439c---dukokafedokinijenozikowa.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/56836037840.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317f177eec3---61722383182.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/fumonokuvitabugek.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/51016187242.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/7185719108.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/62904586875.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/82331149147.pdfIn PDF document text
    • http://vtaky.sk/media/file/16228072743.pdfIn PDF document text
    • http://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/71566352235.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/76745916942.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/92596394572.pdfIn PDF document text
    • https://fobh.net/userfiles/files/vamepumesubobisatite.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161385c40140cb---mikos.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/sepaxevi.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/tuzumubozerorufogivugo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df2001b9ed---77333765229.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/tukodifajimil.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/jowatomujavukusa.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135e39059de4---dezanexexesexakabajatagad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=design+of+everyday+things+free+pdfPDF 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_off0000dffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 10912 bytes
SHA-256: 3693a58e4e6631aa400c805fa816d0c6d3166206e5cc130b6bbeb892ff4e22d8
font_01_sfnt_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 18092 bytes
SHA-256: fcfa6d6e9933bf9003fd672757c1acaaeff6f61351eb55c0da9364a3a510a736
font_02_sfnt_off00012825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.