Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9efd0d600f0d74e…

MALICIOUS

PDF

119.3 KB Created: 2021-07-01 14:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cc23f78a23ae92f4dfd203ca30b6da43 SHA-1: a27e6f2c59797062fcbf04ffe75d91b82ef0612d SHA-256: d9efd0d600f0d74e62bbb57aea0c32874cc01b977fc780f349f0bce3e937db3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified by ClamAV as Pdf.Phishing.Trojan-d2568dad23a94d95. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to compromised CMS upload directories. The ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/4dc753510797f33cb65d6460b81edd63/bidowi.pdf In PDF document text
    • http://www.tokyomagic.jp/images/library/File/81492590198.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ec39580f---38953525660.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd150e54e0---mabulewofudolepirotup.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501033527895885.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/21620914112.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/lojizijetitenodopesudedij.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94494804649.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160855af914589---dozekolatirug.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c256954dba3---tejilesudo.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c20659d004---19028887548.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/62004209046.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/71593005e73bededd6c9c057568e52a2/nulan.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2b98deb34---wezoleju.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16099d81f3eea3---wujimora.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/kawaremizovodagolapinepu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8c2c8bb735f473a86ecc8adaeec3a8cf/mikavakuvarabipakidulile.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e5ab36a1d0ce514752581a9f53b78549/pidorinotetiw.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28f6651538---xinatipoleripagalenotepa.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1437c6dbf57dbcbaf27264562be395cc/dukojuzusulid.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf580635d---37149667466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=two+types+of+sonnetPDF 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_off00016d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001853b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1853B 21596 bytes
SHA-256: e1e88bde295de99d9b04500256b9a6ed8281dab9afee6ac052143e74e2cf97a5
font_02_sfnt_off0001b955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B955 10116 bytes
SHA-256: c61009e9fec82e28ec91b9ee2403c88acddd65373eb3aa3af7907191bf0a1fa4

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