Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fc1e2233579d0a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 13:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac74638315208209cf98411d68c8f9c5 SHA-1: ba4399d39eeeef5501948af445b070fbf8f0ddee SHA-256: 90fc1e2233579d0ace5d7401284c9b8483b8e4e9d7ede00a6062b4916822e209
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/iu6364o26sdmr94llunraq51th/26351176443.pdf In PDF document text
    • https://liur-krd.ru/userfiles/file/dedumi.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/jepovem.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/juzeledolozesefepukiwuli.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/dfcade6d97757710c9950fb715d4dd18/tagezeve.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/16215236451.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/wirikalukaguso.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8109836c12---ruboxepu.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/42959870510.pdfIn PDF document text
    • http://vieclamtaichinh68.com/upload/files/73551882277.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/tixowibogurufonamafasaf.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/15460516957.pdfIn PDF document text
    • http://newcityhk.com/userfiles/73194589790.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/9467268619.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/kijumorawomigokimiz.pdfIn PDF document text
    • http://effektfilm.de/files/file/60145631089.pdfIn PDF document text
    • http://ymmicro.com/files/files/dijadunum.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210807191400249856llywtf.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c3c030e44ee1c40ab387a5502f31b873/69600258584.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ubj1lq37lkpnalfbvmfcg67a27/81037952857.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/lotebobo.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/renisenenutaxuziwefitakuk.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/nokikutidasofegijisowex.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/96375804694.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/11398871528.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9188deea---muxixaredewazeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=differential+equations+and+boundary+value+problems+5th+edition+solutions+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_off0000d72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72A 17564 bytes
SHA-256: f9877c6ec2a41ad50967d4daf2a99e785d4be3de797c2edd319ec52dc3e575bf
font_01_sfnt_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 11464 bytes
SHA-256: a7443e8946c9d9cc668537392ed936ffb03d40f951011d4c59bcc090c031e244
font_02_sfnt_off00011e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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