Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6952509012b7a9b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 19:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c3c5c921479b3a325e16ce653705d651 SHA-1: 6b4fa3bdac5b4863858769aef360daf4372fbadd SHA-256: b6952509012b7a9bce4590ec12ac6c7a4e77d5d9d30a7f2eff19879f90a21cd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected it as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farms suggests an attempt to lead the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://safetyhanoi.com/userfiles/file/naniwukepe.pdf In PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/dezegilivof.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/wepadijajunasufesef.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a3e742a0b8605550b1a7d4d6aaeebff8/tolowanufuxenudu.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/kuwemel.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f8ba1f075a270d8bbed38da0f391487c/37433290501.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/koninojidoposizaworetus.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3359f523849ac6d6e3324458b2599b3a/fugosabibedivuxesisiveler.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367e5f26aa7---26251936893.pdfIn PDF document text
    • https://baptistfriends.org/media/29490574773.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/wegobolowur.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-6/20210906151811629952.pdfIn PDF document text
    • http://origo.ws/userfiles/file/jawegegisevoj.pdfIn PDF document text
    • https://samowar.ch/upload/file/pabobolipipewokatonogase.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/62838061244.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/relopijodifesukar.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1aa80c6701c2848b469741cb90155de8/5478828923.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8ce049522---35596800738.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/93448368441.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/25617415019.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/pilatedomis.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/484412f6d6b8a2e330ae8ba2bfbdead0/lidofesatelabusapodelin.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/71887046374.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/5647481835.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/fusubulama.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/77193184789.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/marepudujefavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=installation+aborted+android+system+recoveryPDF 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_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 18496 bytes
SHA-256: 3b4b85df84d1b017bd3c0562462c19b22fa07c6f1cf39eb81ba79f6dafcb724b
font_01_sfnt_off00010937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001214e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214E 10804 bytes
SHA-256: 6d9d86a1b95ad36a544a2c1c657ff9d9c10ac3d1e572155f7aafea3ccc6a9e8d

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