Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79e2bd720968cc6…

MALICIOUS

PDF

78.5 KB Created: 2021-08-20 21:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 07d9eab2e426f1441343d14ae32dab0f SHA-1: 397313fe44ed1f24c1a0b024ab80c3f717a15346 SHA-256: d79e2bd720968cc6b0eba5e3e4c2cab1a2d6cbc6ba7ef8f6b4e88ef66b4d4066
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it contains a malformed exploit stream and points to a link farm hosted on compromised WordPress uploads and disposable domains. These links likely lead to malicious content, suggesting the PDF's purpose is to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8402

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb82295ca7---9323716811.pdf In PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af893401371---boviromekux.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/e478b6174322ae7a480450da4e5f0d41/lufunefepumijex.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/52f6ceb1e33082f34c627947a7f188a9/netuniji.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a890dba18e---18272496522.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/zupuwuvudamevepuviwiwar.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/78207629261.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/28097226257.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3eb456d34---puponivelumu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad122f6bd43---5484381278.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/309ffb73f22d939d435fe45fff206380/9955284440.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/153943b39f6307379037fda5ff44f387/zowusubesagimem.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c6cd055d7fa02e88cb37c80c91ebbe1a/47276037269.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bf71c660---kivufopiwimedifun.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/wigugidosetexivuwi.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d28cf290f8e5cb57c36c880c19c01bf7/roranafipege.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/74828726102.pdfIn PDF document text
    • http://mousike.it/img_ins/files/53814820242.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/do1e8je72m07b33f3c108e025r/nilapagugivapesobige.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/xitibobugumajejukikij.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/8c7f7b90dd4c4c3bf83a0e4cceb7bde4/61420311258.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/lajobefijejerarexipipe.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0023bf9fc67eea7ca002d62dbe9144f5/dilifubiver.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/sigerared.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=manual+para+resolver+el+cubo+de+rubik+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 10904 bytes
SHA-256: ffcc8af95a981864a449b0fca84dbfcd35a363f2308ffb3464c387f304bd576f

Open this report in the interactive analyzer, or submit your own file for analysis.