Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe75bd9de1dbe5d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 19:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d5f2ca71d16d6b15aea205518b83e07 SHA-1: 87f1bd8ceab86d39e2028f39070d41133c97e165 SHA-256: 5fe75bd9de1dbe5dbac09e489b9b720a4202fa9235305fe68b615f786a22f991
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bwawarszawa.pl/upload/file/93747972803.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/18609789499.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/54732638004.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/pekide.pdfIn PDF document text
    • https://tigapilar.com/upload/files/63192923926.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/pimav.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/15337453638.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d747186f222---xokesozogazijixuwafus.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/9949840309.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608f45dbd19a6---wifojutulatutozugupazaf.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/wusuxo.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/matifumajerejajajem.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4d33ccf90---78235599420.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743773aac91---39608194256.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16129fa3f0859b---28166170966.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a421cde9f2a---45932814389.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/25076640226.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/11421793126.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/5507e45e37081f9cbd9b840b2eee4ca8/42099647035.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6819e9c9cdf8363570af6c35b116afec/janutewexijogedo.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89852b3203---sitiguvisosejikepidubog.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/59974557100.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a65b5712e8---5314194853.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/63009424005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=matrices+and+simultaneous+equationsPDF 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_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 20116 bytes
SHA-256: b47498fa54d0b2299ab5dab974203f29413688f5c0e8984ccb1709f0969cdec5
font_02_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 10768 bytes
SHA-256: f123ea38c55654d7c00c9ea33a27a54d881c1d7fb5328e1c85f13ba43d1a96a3

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