Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e38033f76f2394…

MALICIOUS

PDF

79.7 KB Created: 2021-08-20 14:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4731e7a720fceb860f32cc7d7d5b7c0c SHA-1: 7755b457b11f8c15e4025faee779e4baac4f9408 SHA-256: e7e38033f76f2394d7e2b54fd4edba1b0ae723e8c82a3cd16d26dd38c72f354f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially leading to further malware downloads. The presence of a 'download button' lure suggests a phishing or social engineering tactic to trick users into initiating a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=oxford+american+handbook+of+clinical+medicine+pdf+free+download PDF link annotation
    • https://ewastexperts.com/userfiles/files/62501385734.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/nelewededebazigita.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6a930dcc1---49247297602.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/28287411526.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/76109554325.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/93774622026.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072389c0170a---75137274043.pdfIn PDF document text
    • http://techbis.pl/files/file/34130176490.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/jubokuvepuvulutezabebol.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/64607258022.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e16f8c91ec1---25891860394.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d958186b6---magimapud.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cdbbe994e---goned.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086726c6509b---15945606108.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/fasemuzajeg.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/xulalinavid.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079116d9bb73---73560532777.pdfIn PDF document text
    • https://wsbtitan.com/images/file/ranozex.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/cf9456695b199a169850ab770d2ed5f7/65920253290.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/89608523608.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/dekesowowizin.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/2731204763.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/wogevuj.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/b726457566b303228c3a595c8d781295/rozoji.pdfIn PDF document text
    • 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_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 16432 bytes
SHA-256: e17ecc73a7b883edce7bc2623e6526beef7c59c69f25cf2a0a25751cf43a6e26
font_01_sfnt_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 11064 bytes
SHA-256: 8c95ebe3e2a8d02092b048376b60caaa49ff213625de4da58ca475d2d27c5b61

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