Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f95f32fa19a6d08…

MALICIOUS

PDF

71.5 KB Created: 2021-07-26 02:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5249da99cfcc31ec6ab56aaabc15748d SHA-1: bd8c8ee46c33bfd39b43c5ad1207252c67e052bc SHA-256: 3f95f32fa19a6d088c2e96d225460fbab676ce90e5e87d6e9f860a8674a6491e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d969c1e3a---muvozebolukud.pdf In PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/67542282783.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/75953149599.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/8624303106.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/porunulonimix.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/3d8b2c14b3b6e08a3b616defe54e4f6c/mopinatawoselow.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4bfd5f206---78626547507.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/82464178364.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/71800826914.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/92696628100.pdfIn PDF document text
    • http://citra.cl/userfiles/file/lalopesamimijak.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/nbtqaeuho83ummbf2nblua0bki/puzurawujipowuruxi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf42048cd---58153074641.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/bafofejesedutowotapusosuj.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/favevelebonazekaz.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/07629a93a17964c2e43b2e07cdecab36/muvujabovug.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/39700757025.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf85332756b---67346902184.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf9ec6eb72---lovomebatuwodobi.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/f8b9e29bf6e35dad718369631d4a5a26/40606246252.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/56819302665.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/lesumolararoturatagogo.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d61712884afe20ff5525296bbfc7587/99053115521.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/91054166090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+i+reset+my+voicemail+password+on+boost+mobilePDF 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_off0000b73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73D 11072 bytes
SHA-256: a1116a1edd32926db1127ccca9e753953b851bd73fc9d48e99c192bb925b1e61
font_01_sfnt_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 15384 bytes
SHA-256: 18692fb038f2b76ee9f56c51893de4267a38fd17fd858c98f6f27b5644ab523f