Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7f251381a67799…

MALICIOUS

PDF

62.3 KB Created: 2021-09-05 07:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3460ab28035d494749c459594cabb673 SHA-1: a34157897f672315c7dfd65e41e75186c13a90f3 SHA-256: ae7f251381a677992a952d89f0c0d279c0abcef5f35e824c0323877965de4df9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7016

Heuristics 5

  • 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
  • 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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/49b227197b9a983d6320f8a11393d729/28039259216.pdf In PDF document text
    • http://bitite.lv/media/txt/122/file/25419559810.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///93098538728.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/8eut5qsr2lgttl7vou1hqvoh3c/fijujubaposora.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/duxefaba.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/munili.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608d45983f162---84762206788.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/97252985273.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/33380794807.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/84183318790.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862f5440dc7---sapadadose.pdfIn PDF document text
    • http://lecostationery.com/files/file/jovusagugibofubebaxeki.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/sopowokexazebubesufopuro.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/pepijasotegizuduvorizaxu.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/69553880223.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe599f649---86012446030.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5866d3f92e209418c4d81bbffcdafb43/44118420936.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/nvkbsq3fg4lbum3gvp56orfnq1/55094169820.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/7123638701.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/zaropopelomir.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/33058243224.pdfIn PDF document text
    • http://mosjob.ru/images/file/dubosujixelogutagipovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=open+png+file+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB85 16452 bytes
SHA-256: d6e70ccf6f492e7d6d20698d4c483d65ea7756e7dc4ba22eb7ba33fda77a5131
font_01_sfnt_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 10048 bytes
SHA-256: 20ca6476498341385ba6ef29a4d02a8ec517796e605d2c51903e477912883e9f

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