Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ac041ad2f2016e…

MALICIOUS

PDF

74.8 KB Created: 2021-07-18 00:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b2fa76cb803aaf3c43f764cab0f25792 SHA-1: 38d79bc4b7014a8e3398c15a38f7a5fe0317610a SHA-256: f4ac041ad2f2016e1819f1c06b6ef8df5868a8fac0dcd1e80c3472672e532a0c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or content distribution scheme. The presence of a 'curl' command sequence in the document text indicates an attempt to execute external commands, likely to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7985

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • 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://sostrevalli.it/userfiles/files/kemexikuviwixuzazozomika.pdf In PDF document text
    • https://vigiweb.cl/dinamicos/files/file/rezilovukavadib.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa42a744ff6---dipanoxerulusabetedeza.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/51b968c7a5328d7334470b5ddf14ea20/1349264245.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/51874534098.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/85683546311.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/67044925066.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/eb1f46dc3578489ee1f14277e08e84f0/moxiga.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ajpp81g5c1bgcmkplnb0c4sn8k/62988391427.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/ruweroxagaxijagotikeja.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2c2e4f0c2---lufumizibuzepoloje.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/55981426942.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/kikexikoserakiwokumu.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/zelotuvonelularoson.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/58332059694.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/reninigekebirugan.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd4b0eaf6---zokeladapu.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210623_141354.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2m94s0fo71ahihoemh39kqioe2/29116316638.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/476c0a2e6e87bd9ae275267315709222/xisefikozidenujome.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/papivuvekipebaxaligiwaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=define+gradient+divergence+and+curlPDF link annotation
    • 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_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 10532 bytes
SHA-256: 79506372bb30eeaf17badb9c4312b11033caa737127ce1b1428556c287b942a0
font_01_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 16480 bytes
SHA-256: 13f5fa3ac204bec6b0bf55c1ed1a54325472aab78dedd249443b1aa1812d60bd
font_02_sfnt_off0001180b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1