Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5d88f93f495820…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 11:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 53399ab60c11a30304513d97c5e81bb0 SHA-1: fea8467576b1a47e72d727533738a18e7b4718fa SHA-256: ee5d88f93f4958205ad790206b6ecd9eb5f66ee07a354791e9aceccfca414fba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=removing+a+bike+pedal', likely lead to phishing pages or further malware downloads. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=removing+a+bike+pedal PDF link annotation
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afd22148e---lovatanu.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dcfa165df---vaniwenileliguzeronuru.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8cf76884a2296a2481e2d077f5942707/zivujemawewarajebunewo.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/lodig2o4potrf6lc50hsjhmh7q/88599447656.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021062711329_1050049349.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/78d215e7e4c40312bfeb4e7c321c3857/diwijako.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/lmdf2vl3ds3ihg6mame8bs96n2/lufafinirarutudale.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/48301be484ff835367e5291c0862543c/72558477946.pdfIn PDF document text
    • http://normel.org/files/upload/file/18018778920.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/d0oui2bgs25jq1ohmilo2g6tto/54642198792.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/muwulegebunabiduxejasuk.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3fa6f9e99dacb546be454deeadda1638/zonatokavowunidupesut.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4360e1820a4f1e9670f5044982301103/13935607791.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609430fe6be7f---85562694998.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/82de1f929a1c9b97602186b0c42d8032/misapiwumanujuwomimak.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc598671aa---joruzamizado.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090adaad4777---nururizelofomu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081ce4494bac---wumezavep.pdfIn PDF document text
    • http://goref.ru/files/file/17299141403.pdfIn PDF document text
    • http://fruitvita.com/files/files/34046183311.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6702e95124---zorujibik.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/73bd081f2623b0ba594f058f4802aa66/jeturewiliwurugoxizeto.pdfIn PDF document text
    • 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_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 16364 bytes
SHA-256: 32fc7248c575af916fc0984eab32b7299582e526fe7b3b879f6e77d60dae7587
font_01_sfnt_off0001189f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B6 10712 bytes
SHA-256: 985e4ce55fe29ab33a2baad32f4d42cda17d7e9fbe89dbbdeca4649652a6ac27

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