Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7787442db9ae37d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 10:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a062843e6adfe494c832e9278852ab58 SHA-1: 0dfd504f4278d8f84aba6efb4deb324845835236 SHA-256: d7787442db9ae37d2e24aa7bb6066f7d0b00352f27dff08469dc3b169e68e3e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious sites. The presence of external URIs and link farms suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/mipuworumopizoza.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/675284977.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/30969159263.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/72973568507.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/bolujipota.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4538da7175---wapawijabebuk.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/lavinedow.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4ktgs2knetjpid8intir4dick5/45250919161.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114c4f81e79d---50129196858.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/dj4sdil3ms5pq98mdj05apr8qu/mizejizap.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8ded46be19a46d9ef292b8f648f37845/8742316877.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/jiwoxavuv.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dba3486e2e6---todorokoro.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a3ed26ec253f8547fcd8d233cc4f3863/vikujifadalepiw.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/jowituwesagumivapami.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d9b2372b1---98867992753.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///32015034270.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5f754c00f---89647819040.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/nokalozuletelolitosaf.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/witekij.pdfIn PDF document text
    • https://auto826.com/uploads/files/veraf.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/46291582092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=free+online+jpg+to+excel+converterPDF 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_off0000d630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 10496 bytes
SHA-256: 27b0a895efb4a412f3eb009fb5ae73002af5a3a7867e0048044d136ad1d61ae7
font_01_sfnt_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 17556 bytes
SHA-256: ccd1bea9b912063737685899800b879a81cb8f71dfc23fcb6ae09b1ade25061b
font_02_sfnt_off00011bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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