Malicious PDF — malware analysis report

Static analysis result for SHA-256 551b60d7219b0b5f…

MALICIOUS

PDF

87.9 KB Created: 2021-07-31 05:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ada9b27aa5d701592aba78130bf0adb9 SHA-1: 4fc8050e35694bd93932967a8e560ed102cbe8cc SHA-256: 551b60d7219b0b5faaa3311877eab5801ba3770b6d48436e9b7bd8aa800cfa79
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous unknown URLs, many hosted on disposable domains or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing numerous embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cdn.eagle.mn/uploads/userfiles/files/robulon.pdf In PDF document text
    • http://acmemask.com/upfiles/editor/files/15761722183.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/10532134383.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/jejasojamab.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/66059095431.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/gobubale.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/79557373974.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e3ff1d8ba0156a12bfb3ae7d2595347c/sufonobanebobusojo.pdfIn PDF document text
    • http://sciattella.net/images/file/24451412225.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/xifefukugejalofuta.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/wevax.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/vetupuduvakizisatusiket.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/a90413e20f5efbe425cff7927c8acd4d/padafuwopeda.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/80235359363.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607443027d0f1---dubavexizu.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/negam.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/zixomenanosuges.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf1ec9b05---musugewazimiso.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/41016f6b932db198063ae6121b0425ea/23081219271.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47e8c3cea3---zexijiwupojomobaxeru.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b885dc9619---74683315717.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ee0996651---kidemufazimoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=analisis+literario+poema+20+de+pablo+nerudaPDF 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_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 18496 bytes
SHA-256: 3fa1fd21a7483b836d53ad622bff59e2641a079ca6592c634f156191d6d9aac2
font_01_sfnt_off00011e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E01 11016 bytes
SHA-256: 25d3bf08abf5d4049ae9a43a76b9a604b2f9723c3a526ac34fa540f4a42db992
font_02_sfnt_off0001376c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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