Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2f048a14a4cd86…

MALICIOUS

PDF

73.8 KB Created: 2021-09-23 17:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4eb9b2dd58d43680e9c5d0d8b53ba75c SHA-1: 6c7c1d9ac4253710e2272de1167731b61cf244c6 SHA-256: 8c2f048a14a4cd86bb5ccda3fb50eb2de588a9b8ac87065adce0264219cc394d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised WordPress uploads. The presence of `utm_term` parameters in some URLs suggests a phishing or SEO manipulation attempt. No scripts were extracted, but the PDF structure and URL patterns indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=connect+ps3+controller+to+android+without+root PDF link annotation
    • http://pcccphucvinh.com/upload/files/39679893870.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/59487354362.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/56509466073.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/51458784999.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/837f8aa7d58b605e8df718c9e17b5bda/74896760090.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/26720600692.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/dikasirirugefabofomisadi.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/sozana.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161338aaf342ac---81103002382.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/32573672613.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/boripefiromu.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/95652154484.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/62736704036.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/60832236513.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/11301152870.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/22022085450.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/63050101555.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/juwofeloletexuxinexomulo.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/88220942367.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/vilukitawipogofonov.pdfIn PDF document text
    • http://esangsok.com/upfile/files/rivefada.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/migitabuligovemeruvokixi.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8c1582cf---sawolusanafexosisovi.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/mebarizuvowadubuz.pdfIn PDF document text
    • 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_off0000bc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 11000 bytes
SHA-256: 43273bd06238b90557b3860c4395effb0c99445e0efaa2bec5cf8d595a084eb6
font_02_sfnt_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 16576 bytes
SHA-256: ae55611d4152f310f5b592fe37d0dac0dbb5a5e7ce55b9a58731d0925e607ec8

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