Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b1dd80a101cefb…

MALICIOUS

PDF

85.0 KB Created: 2021-07-04 05:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca24eec70b71f86cae0b6716ab7d1a4e SHA-1: 77341286faff4ffd00a0b3fc9e35fe2939990741 SHA-256: 41b1dd80a101cefb9c5f05dc2eaf4aa358dcecd95df4b5ac76366eae930975be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are likely used to lure victims to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f9ad87f5341bb33c408ab908cdbce9b1/18896015751.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607743d425b8b---67657254049.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/76433427179.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ebc5c63f0---84150587629.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a92adcfa1---82985089764.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ihbhgp42ioigu7tfcfrhnn6fm2/nadatexavabexekuju.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607334cf2e3fa---julosagovekajabinediraxok.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/9bc6b76481bf092d73b3ffe8cd6b5bb5/kolefituwip.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/pilav.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/af0156a221a11082da46dc2a1c3224d4/kujofabisoda.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/led20apm736pee5fu5bghga3am/davimadinirelir.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/p03s2mjle2q6eblq5b65nds12j/2167857515.pdfIn PDF document text
    • http://iwishop.hu/file/93056103678.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4f87de52a---50596861950.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608326fe41de4---zokawuba.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///rikegizivowinexamakerofu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/626b6546e2647b39c00d5f9c467117b7/17163785553.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/debae8b1dc1803869573d0a2b2095115/55233364317.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/20005404930.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6bmhbo287nq0lij86ajngqguk1/xekidodi.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/xijumesojenojij.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/72629219344.pdfIn PDF document text
    • http://charivne.info/images/file/mevorazafutovuz.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/kawesekaponevapas.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090dbdc15ad4---99732152093.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4u626c8a0n29v493dco8gcqm29/69822301690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=medical+certificate+template+wordPDF 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_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 16888 bytes
SHA-256: d3bb7ec9f127d4ffc07014194ad2e9867c22217e845196880d46956e4476c35f
font_02_sfnt_off00012c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 10588 bytes
SHA-256: 32fd66c9f67ec850c512646393113a970a57c1da6fcd973c7f3692caf6be8e19