Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a49f633b96f3bd2…

MALICIOUS

PDF

91.5 KB Created: 2021-07-22 10:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cea1b345f93cd20e191fdb0815d3d737 SHA-1: 53454d3f54f3a93a797cccd795677bd5f1899ecb SHA-256: 7a49f633b96f3bd2e77e349f021b5a4736c23d3d86f11753115ddd282809d223
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external URIs and a link farm structure points towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://trimix.bg/UserFiles/File/sofibotorakija.pdf In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c12ba25e46a---gomereginixowuwevurajorib.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/zuragezokibotikoga.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160eca0432cf6f---59426212097.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4289447c55---90382971449.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/merazij.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/5284857143.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210702_031311.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/vijedofu.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/18594527776.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/20373863741.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7fb9427fd86824fb8df7ca717024cc52/vaxizojupavomolagivafotop.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/doboxikofelutojef.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/us0rjkt0ltig97tpe24ojncvvb/51799464282.pdfIn PDF document text
    • http://royalgroup.at/tmp/zapibawuwebuzukereduzedor.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gsj02nfvaurcev829gjb01prv3/3092818949.pdfIn PDF document text
    • http://domainecomps.com/documents/files/83806119636.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/61374965784.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095903e04858---wurolobaxafugusufezuta.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607384a277e4e---tokivepevu.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ed9408c6543c5b37e3fd3d634e39d241/mibixabonuwu.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/63538539728.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/suponaxunibowadotub.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/41965692432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=nothing+further+from+the+truthPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011da8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11DA8 24432 bytes
SHA-256: ef4333db69eaf9bdbb8d2d446c110d39e90dc46c084805217bc10a1e217296b3
font_00_sfnt_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 18080 bytes
SHA-256: 9579637ebb659c1613f9675f621bc076b140b94cee788b6aeef3fb484143cd94
font_01_sfnt_off00010597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14903 10364 bytes
SHA-256: aa32fd668b258a09b5c590838cf022e57c03f5c3c788dddd2f5a239fe1804098

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