Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed026dc15da4eb13…

MALICIOUS

PDF

101.2 KB Created: 2021-08-11 05:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 107689142127506d9be938d3f61349e0 SHA-1: d8c93ea9c6361c5071b8fc9925798c091369c0c6 SHA-256: ed026dc15da4eb1368bd806d35c7edf24b83ed7785b914f6be58740682e5708f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.peretprod.ro/content-images/file/vamizilaremerugubazu.pdf In PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ef66ad46---82666651308.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/k20ruj391v4kb7ag1udn5t523p/gebafune.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/3d8b2c14b3b6e08a3b616defe54e4f6c/mopinatawoselow.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c89566f16---72014690842.pdfIn PDF document text
    • https://sce.tw/uploads/files/60fa21c7a4f43.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ed775df1bf19b7ef52a334f8b61ebd64/fixobesuxipuveguzezedegek.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59adb780e9---gaxodavixugufabuporerazu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a271845ad64---dozalobeb.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/bitudozo.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/pojudixaxidakeximam.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/5945f472434bc053c603c0e7288054f3/43431902370.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/42958406931.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22197f7d1---fatidovavefip.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/lamepefabeberizimiz.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/99110653606.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a300a7e4db5---nixijipevumu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0r321lcrpe60o4urj7438o0055/16259613230.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e00779a51---47307390318.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9b895336e7b96c034810d0d1c8943e8a/91194443666.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffe04404ba---getuvifali.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dd14ef34c---94704186613.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/6s219370ini8dclhaccppepa67/vitafeximosuzexovujolexek.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/mewenikonomemuvokusi.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/nosobuvuge.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/fobanagukudexijorube.pdfIn PDF document text
    • https://ahha.az/userfiles/file/liladijubunilodirigizofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=top+down+and+bottom+up+design+strategiesPDF 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_off0001270e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F25 10980 bytes
SHA-256: 27dec179e8ba064c309419ad5833ef19c027a02cd56b4253b1d1d97bab9dfc07
font_02_sfnt_off00015840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15840 17804 bytes
SHA-256: d2f1bd6e129cd04d0edad027b91482176be8cef56829eee71e95f722b9972283

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