Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d3d674d9554b67…

MALICIOUS

PDF

165.2 KB Created: 2021-07-17 20:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a083ae4329487555e836d02ea981776 SHA-1: e2539a92a363505c6d2dd777c5191d2703613e3a SHA-256: e5d3d674d9554b67a21c513fcd84a85f5b8f239423bc2b2e7b3e429ac4e45c81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress uploads and other disposable hosting sites. While no scripts were explicitly extracted, the nature of link farms suggests an intent to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/oj13enf0g7qi9ohbuk6a04jir6/8053471679.pdf
    • http://seyrimerdin.com/userfiles/file/degidotimup.pdf
    • https://xo-sound.ru/userfiles/file/66698218879.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e56ad7c6d---57851478894.pdf
    • http://karat-dobremiasto.pl/userfiles/file/burizobifepisufowug.pdf
    • http://www.climatisur.com/ckfinder/userfiles/files/13591059024.pdf
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/detumu.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44fecef31b---kitafewosigekonukopagifov.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f12f7bd781f38f73355a9006b91a0f32/zaxogijifawasatidalulajit.pdf
    • http://barnesfamilyre-union.com/clients/52050/File/93777136711.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608256c3d6af2---fepidapatemawomutuzogupov.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf167655ab---33853860981.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073f31012882---34662578249.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7837e30c6fb2b0112a69e532b977bb80/22719169124.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a5c1dc86e---50187942589.pdf
    • https://codecs.ro/images/file/nefunepolojif.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/r5vu5bfgt1fjvq5mulqf8bniv4/81453292019.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/n4huf9082qiprm5s4e2e1ukr93/mufuwaziturekeke.pdf
    • http://alanurturizm.com/rsm/files/wazofavosevunabad.pdf
    • https://alshaabcoop.com/userfiles/file/24361334196.pdf
    • https://goldenapp.net/file/sazipaperat.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=thus+use+in+sentence
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000228ba.bin
0510e52cc72ac31aac9cbd57cb146b051ad605d6f67014c92c0924e4b9449cc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x228BA 9960 bytes
font_01_sfnt_off00023eb9.bin
4b0a1ba4ec2dc1e464dd591a4c3355523393bd579a446da173e1dd9c911e5cc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x23EB9 18472 bytes
font_02_sfnt_off00026fab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x26FAB 16792 bytes