Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9787cfa59b17963…

MALICIOUS

PDF

81.9 KB Created: 2021-07-20 19:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83a05e27b7a6bf1ab0ac1e73dc92b916 SHA-1: bf252fcf69e7f0e6ca1b2c3131accf8c9ac3cc5f SHA-256: b9787cfa59b179634b3e1622330f3d06dab12b6c0d7b4a77cf7cff8112a23dec
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070221e0ca58---14299958719.pdf In PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a92b478f9f5---79552048832.pdfIn PDF document text
    • http://aplus.to/userfiles/file/xoforeremolupalarurux.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/94d328090e55ce521feedbe5e0545f9c/45522205116.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/kojizonupevobagotisisakal.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/64669143418.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a64d47c44---37191411310.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/mufinuliwukitomiso.pdfIn PDF document text
    • http://honda-vo.com/upload/file/defuvi.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210701210204.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/19209343496.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ec5706f8f7ef11401330e0f2958b754a/zefobazateranimogu.pdfIn PDF document text
    • http://otczenacts.com/media/files/vumudob.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/57978460089.pdfIn PDF document text
    • http://pk.mo/userfiles/file/motofetorofulemaba.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb82cac3831---74521937665.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/wuwivuraxekafobomi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/meqjd1m77u3u9u8s6j2b0j5ecr/wejejimolobofesozasipo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37c26e6d3---52258459433.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/wenitukudulofi.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cca4942c3---46340049451.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/87310806265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=oh+sweet+darling+you+got+the+best+of+my+lovePDF 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_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 19988 bytes
SHA-256: 861b6032af2f01147e36029dbd004f936c60247d069850df885581c52c2f61dd
font_02_sfnt_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 11332 bytes
SHA-256: a2c4c1f886dffc875d68da4912be19fe730b5e6f1ce7d805e6fe285ee5fb2db2

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