Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc740d2262eddff…

MALICIOUS

PDF

78.6 KB Created: 2021-09-09 16:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa397166d2533676a2957cce13f18d03 SHA-1: 14ffd1209e6f43f4726dfc8d74d5e41f1bbc330f SHA-256: fdc740d2262eddff37ee5551bb318fb32aaf797d675fb1c0adbd3b96f507483c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms points towards the T1204.002 (Malicious Link) technique, and the nature of the file suggests it was likely delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=how+to+bypass+ipad+screen+lock PDF link annotation
    • http://ztkammer.at/uploads/file/putafunenopenoxajoradet.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/78434771089.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/51108811262.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/24370164802.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/durabilokalaroz.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c6233b486---ramemiwod.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/874950179761b4dfa738de820d56a021/80392759043.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/foxerivakobenaruxenutuvam.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321507cbd7c---60732425673.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/rigabafisex.pdfIn PDF document text
    • http://ombs.ru/uploads/files/63631466545.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/xilufomusu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137572cde848---satejelamivud.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d3bfa863e3ffc6f1e824ff66c301a619/goradevofadewuzitizup.pdfIn PDF document text
    • http://mestan.by/images/file/votadawibodavutufazaza.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/21158393244.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/27711356400.pdfIn PDF document text
    • https://jobtiara.com/files/files/32930813557.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/jejipunifudubekoromojet.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/95982499884.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210906121253.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/78625164167.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/40864075716.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/nuraketimamanomar.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_off0000ced4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 17256 bytes
SHA-256: c85cdc1802f35e578c9d8c6718b0a51a29ad9f31d8b94be50935491333f4afd9
font_02_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 10928 bytes
SHA-256: b17044c54ddf43835cbacdf6e69cd0473e5e9c100a390e6ebbc68de3df815920

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