Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f0d962b3186200…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 09:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 436f378ee5062742c91ceea53d44c49e SHA-1: 3b814995ffe6b07a94ae77a003e60366245434db SHA-256: 55f0d962b31862009f1e95494eea4bea5c148b1b8725e0bf6654f73a4b86a63c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d329a33bd77c9a3164dcb892babae6d1/94228072814.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f2e794fcc---92738885522.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/ruzulogivaneguzuwe.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/55070886328.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/88421cf6b045db1896d07a0025315d62/bozejubidirukifaxumu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609db526e5dff---14840785022.pdfIn PDF document text
    • http://amandamaitland.com/images/file/lonewajosale.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b0691355264---toxaxerazidul.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/28730841850.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608040927ef8c---rowarivemapumogokoseneme.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/92472656552.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8933dfcd2---migigokuxirijam.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/25f0c464888f76240486459a6a82766c/gisejupotikajopirefufaz.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/46528456942.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/pajulakujotezakarajevilir.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/89281194645.pdfIn PDF document text
    • http://sjanzee.nl/file/kedipigotojabimegaxowe.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/51062091027.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/18365999829.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3562bd84608cde0126553b6725af1474/wobezinafewi.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/48522440439.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/67161122248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=libros+de+espiritualidad+ignaciana+pdfPDF 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_off0000b5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD5 10992 bytes
SHA-256: 50f7cce879d4cf01a60ae8511f44f60419cc1cf0e1ab084ca6ceed35f7572938
font_02_sfnt_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 16688 bytes
SHA-256: 2c9fb4f4b2ca9b9dbf56d4da99cc61e6346fc331de2fc49bca3700ac2acbc094

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