Malicious PDF — malware analysis report

Static analysis result for SHA-256 763ce9ab50c493a2…

MALICIOUS

PDF

84.6 KB Created: 2021-07-19 01:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: af1799dab0eb752b22d19e340785ac15 SHA-1: 6ffa7438d50bc101160be9e0371f399172626ca4 SHA-256: 763ce9ab50c493a2dd5768be8f433ad1f46a99af0fe6b52272a8ebbd6858485b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on compromised or disposable domains, indicating a link farm likely used for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the document likely serving as a lure to direct users to malicious sites. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://asdgolfclubtoscana.com/writable/public/userfiles/file/76151070345.pdf In PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/45234769507.pdfIn PDF document text
    • https://xistenze.com/files/files/siwide.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/7929083639.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fea11095dd119934bff7a99e9c8baf41/tipunajozilibofagusulus.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/lebarokizifomipuzekabuwi.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/90f68d878d4759faef8740251054163c/29767253386.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ad566a8a26b---89459253281.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/wiwenidawa.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895cfd1a1a2---45767617868.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/05qjpaods39vnu4v20jiei3jp5/zawere.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c4482253305---rujud.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/7804424262.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7845c44e0---16333884721.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/g946uomamdcdkfni1hlc8dbeuk/xuguloguluzovafi.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b76efda245---dogikedevozoburepim.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/88637181846.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087368dd879a---popogejanelitiwe.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a682ee0d8f---bunajepovifegukujopelite.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/94486514427.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///40454713187.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106051613.pdfIn PDF document text
    • http://ahchala.com/img/file/vakozawef.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/958c21b6cd1358facf7039a6986f1d41/81786174746.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/kp8t7f2qfmk4jvgmuo3ngpvbgj/11392405675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=law+of+tort+and+law+of+tortsPDF 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_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 17432 bytes
SHA-256: 01d9b75487d65feed86bf2c6630aba5bb1b8453e1f43739be406ed0b1f027766
font_02_sfnt_off00012e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E15 10164 bytes
SHA-256: af2d47356493ed06cb0ea45d5be418dc9f00ba40ff5dbda6391f6c106aa53ec0