Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f8a86eb440854e…

MALICIOUS

PDF

73.5 KB Created: 2021-09-01 00:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5e69eb6b0f26b4a9960171a26f70e9a8 SHA-1: fe255c44ebd683b5f3a431d15282832813711217 SHA-256: e4f8a86eb440854e1cdeb4071cac776f30c901e35fbe007e4465290f77c45fbd
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to lead users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this pattern. While no scripts were extracted, the nature of the URLs and the 'Phishing.Trojan' detection by ClamAV strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://geniodelweb.com/file/femazezoluvu.pdf In PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/birepojatutod.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/vigivetag.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/34203891293.pdfIn PDF document text
    • https://bloomeng.com/uploads/24944363885.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/50383551663.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vfj0mfuujcs5lrhijncmq1nb7k/vanefob.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/nepimigirobatidu.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/sigalaxelokol.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c041b4885fc---74997312020.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/wolovabasosozo.pdfIn PDF document text
    • http://fotossc.pl/_files/file/tavigarupixakuwem.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/tiwunatogev.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/bekolufote.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/obu1i1gm4vi78rpkimchet424q/japovewar.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a0695071---38330147875.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/begaduxigoxego.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd8ead376---masaterufoven.pdfIn PDF document text
    • http://kustari.net/userfiles/file/dugawabikomo.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0da12774f9331e212450b147a1c686ff/sapurifoxise.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/80985389257.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a745687a6a6---95540815810.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/fogevapaxilog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=symptoms+of+separation+anxietyPDF 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_off0000c053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC053 15320 bytes
SHA-256: d331724c179146bda1a7e448889b9bd576eab9c82d5da6272e505b9ecaebced4
font_01_sfnt_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 10764 bytes
SHA-256: b5101798cd106479410ef7cae5e6a13c4b66314da50a6f891443d5cd21b4b3f4

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