Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9edfd7fe80fab4…

MALICIOUS

PDF

91.1 KB Created: 2021-09-01 12:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b8fc258e592f0864d28c092ebd54c93 SHA-1: cb08269e70511a5d6215158ca43e728735499e73 SHA-256: ba9edfd7fe80fab40ca9288c81aa6ebd15ae4840fddde93998e35966fee559ca
156 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 of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF link farm heuristics further supports this, indicating the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://anhuifan.com/upload_fck/file/2021-6-9/20210609182529217008.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160968450d35e5---91017711011.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/didulasogekifu.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/tabakilugeguxibo.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/pevalurakin.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/23401264454.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/jujogakafiporuposozu.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106f00493d5f---lubatodubunusorulijaxu.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ivno700l2bf0m7vorjff8g8tb7/wezuzijexeko.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/90282283727.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/44777925667.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/3e6eff97e659761a0c6675218ed9a883/jexilizesewukojigatin.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/5553844536.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22ad51d76---8584190501.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/54989389567.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/8b46b0c88142a433cb1e75adfab6ba80/29504302871.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16119c3cbe2f44---24156244031.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607701a77083e---82170090201.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b83fb3fa28---93141177093.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/42768992142.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/lezuganiwuxatu.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/88181426655.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/suwumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ms+publisher+to+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 23392 bytes
SHA-256: 4cf3f8d7cafb6b72c53b322e4b76abead6d597f585291ca865f1634d8eb2335e
font_02_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 1784 bytes
SHA-256: fca9f8450e1a544ab43b6b7fbe967452567be0f6c717d6b9cf2fcf5323db9044
font_03_sfnt_off00012d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D44 16360 bytes
SHA-256: 4587f3791a8ac35dfdf7ab79602aa4ce591d631069df76d78274fba922b83e3c
font_04_sfnt_off000143c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C2 10564 bytes
SHA-256: caf667cbc0b4e92050aa48b6f9ab8473bdd2631c9ccaa23109821a6c7b22df2d

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