Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2cb618e1b5e9f3…

MALICIOUS

PDF

134.7 KB Created: 2021-07-21 10:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e4b7dd97449a042a83d9cb35e001b77d SHA-1: 8ed203d3b45e48c2d7abaeeee87c5d1c5c542995 SHA-256: 8a2cb618e1b5e9f309651122ab0047566b1b71bbed4f5ed899ac2458c303a09a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised CMS upload storages and disposable hosting domains, suggesting an attempt to distribute a second-stage payload. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9809

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 http://work4shop.cz/userfiles/file/fojowogagirodejivu.pdf In PDF document text
    • http://falerisztika.hu/tmp/dutisowob.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d13a3bd83---vexidudefubis.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cc1f4ac9c---tiruxanovawemumenufa.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c46e1168---fowitowanalaganafek.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0873dfe013ea10e1a34cb558bd4b8c53/15461705392.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e75c10de1---66845622917.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/85038831674.pdfIn PDF document text
    • http://bearcatbb.com/CKEdit/upload/files/642770725.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2192b71b55---48423923794.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/30624741964.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f383603f7df---lexixafamujefozizujexapop.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/sunineda.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3387d6804b9bf99bd2bbe8a170cf27a4/42358237670.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d2c3a7f1---gipafubodajiridesazepoxa.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082eedd9feaf---nutinunareriwixiz.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/35432515743.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/31f6329344f07ead642e5488adbdb378/5394768095.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d1b33b22b---20893115050.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/jatojiduropizovorif.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/55770150065.pdfIn PDF document text
    • http://unseretochter.com/images/file/23958481855.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab5dd7a05---gemofezopak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=wup+gx2+installerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001523b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1523B 24764 bytes
SHA-256: f81fa9915fe04eb9a1507cadcce1945ed8642f89bfc07dba9c133ef9ef8c4f0d
font_02_sfnt_off00018e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E06 35440 bytes
SHA-256: d12c2e807e225fbdba75940353e4918a27c10e8ea1732ed048d6b2e8f2baf87f
font_03_sfnt_off0001f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F354 10624 bytes
SHA-256: 72d1320acab4ee415a3aa73af6e76c810702a0ffb7e5f17495ca660aaa29b7aa

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