Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dbe17c51b3ffd2…

MALICIOUS

PDF

241.6 KB Created: 2021-07-04 13:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b253046988ad225c3b595658d36bccd7 SHA-1: 56dea6e484b0c9771c8662209c33a8589a3371e7 SHA-256: f1dbe17c51b3ffd2b83b8a740ea0a8de8be380712875a264ac5e3df378181bbe
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised WordPress upload storage, indicating a phishing lure disguised as a free download. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing page or a second-stage payload. No scripts were extracted, but the presence of numerous external links points to a common phishing or malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://thunderstar.cn/userfiles/file/20210622204311139638632.pdf In PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/69r4ki6mrgl485ulrmtkoljsc5/99062010655.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832edf29dc9---37756253006.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/wapenafedutuw.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16080f68c5921f---99317593472.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/dipugeda.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38e77bacacc57ccd6c252b49930160db/sudokazusegowezanir.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/03114920293.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bccf992842feb1cfac0e6e84db3bc43a/56608265536.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/t57kos09g5hdf6e8le61lk39qd/23230532946.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/3c75db5692fb9f06fefd59ebd251656c/givuxosiferu.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/tegilisoretunav.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089f3d4e181f---tupijozolupuzak.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/10kns77oi850327topfe9mhmtj/kopevovagejisizarega.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/30918945669.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210601_24664E6FB79B9B43.pdfIn PDF document text
    • http://lucann.com/Upload/file/53731281478.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/auibmkt2c9fekgbf53tq7bhvja/164765645.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ca9ec07d---53885981187.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/82396587979.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/116ea9a384d1771ab808007dc5d0c7ea/zunijukowakepo.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a5caabf25---78683002026.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4fc11f241---wutuzom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=computer+architecture+by+patterson+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_off00035337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00036b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36B49 20468 bytes
SHA-256: 25f3dfc5283677b1897f25537e6349dac49fc46f0b4fe588b4b2de4c246d9c42
font_02_sfnt_off00039e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39E39 11224 bytes
SHA-256: 69d89d8c7e8f575b769fe8597b6e08b0705eade8b8567bc4b63eb898c399ba60

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