Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbfcd8c2dcdef6d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-10 07:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b88f247b0e6b7e3172f8521246ccf20 SHA-1: b149dcf59967d1610d54f3cb5736570539b40c6b SHA-256: 6fbfcd8c2dcdef6d7f378291662e655f8702624ab78a30cf48a3e7b87c0f934a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://fmi.lu/userfiles/files/nefodabojepulemow.pdf In PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/dapifumabidupedeni.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecb4793ce5---xakazilegasex.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329a79573df---58568174403.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/82613528027.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/1215743049.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/pepatezemubipatikufebepes.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090613314127.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/22693649860.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/89956131190.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375970cd889---norabaxasagagas.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/wemorurifufasunop.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/55525461194.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/62373649208.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/norakitave.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/pupimisebe.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/juxujipajopefivelizet.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a405640b8ae4b4a069ad61a7b336ba58/44766457306.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7f007cc9800c7a4d2af0bea00d82f2d4/84629943439.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/majiwudaperojenig.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/25812376739.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/wupifi.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/4088008602.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/73352098770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=e+to+dollarPDF 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_off0000b8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AE 9728 bytes
SHA-256: 53fc2354f9ad1eef4d29429087ab7c27787a78e1a7bb7785c853328251c572e9
font_01_sfnt_off0000cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF6 17240 bytes
SHA-256: b2e538965c15da334b34aca6938792abe05ccc3f4b5b0b27a0713be74e1d1c98
font_02_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1