Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d7bc5b87e7744e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 18:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 397fa4b100aea462e10049c1895241b0 SHA-1: 33262811ed0d420597d934255ec96fa5de1ec382 SHA-256: e1d7bc5b87e7744e9d34e5079f0c1a2a69b0ddd08a090a5beed832b8244e93be
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics point to the document acting as a link farm, directing users to compromised CMS upload storage and disposable hosting sites, likely to facilitate the download of further malicious content. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/80519291613.pdf In PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/89232221374.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138523991dcc---furubewoziz.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/lujigat.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/44672135124.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b4c95683---15685687121.pdfIn PDF document text
    • http://mastervin.ru/files/file/notafafavomadukigere.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/logezi.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/kewanonilubokefetowifuxat.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/nuxeronuma.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/gofupoxomex.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/89098299621.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210912214746106.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/53098054575.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/puredalejupixagutekog.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/51893406494.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/nedar.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161323d9db0593---72412143119.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/mavubujukomemogeludig.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146edb2666ac---wakit.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/d5992b9e077978ceb2b33af3e37055f2/45714613607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=inazuma+eleven+go+strikers+2013+download+para+androidPDF 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_off0000b130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC942 16116 bytes
SHA-256: 16afdac8ea367c498338c6b50bb9e90932ab97b44d14aa6b94ffbe0c00f23587
font_02_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 11556 bytes
SHA-256: ef01519cadf780c61f747f3ff641e27a8b9013c2e0d18bbcd6b72a70bfe70ce4