Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ea307156471fc4…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 06:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 153eb22ff2c612ff1a38d6267a5196d7 SHA-1: 87efc5fde9926a16754ac0c58cb1ddf44ff4cb73 SHA-256: 75ea307156471fc43bfa7e2547bde905cdcc1cf9ad19c097be73351470e6c74a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains and compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is designed as a link farm on disposable hosting, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=magic+call+mod+apk+free+download PDF link annotation
    • http://devveb.net/userfiles/file/mefezinuniwigijezuferos.pdfIn PDF document text
    • http://otczenacts.com/media/files/96954107579.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/4931421473.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/xufenegofikirakom.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef878da9a---bawiwolitekibenel.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/temijimibilasuxerokuzije.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d260d44ee---fapudavakof.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451ad074044---82006587688.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/juvolupadosozedevide.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/39355224945.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/36774023679.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/jipefo.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613630b29d4af---folese.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/jumudo.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/54500079566.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/viwamitep.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/pokizuxosidufotasodex.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/29565653295.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/fubarapijunupuritatanaz.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/72368335998.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/79742809615.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/tavabived.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/rosapomix.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/bukopavarusijuwujasun.pdfIn PDF document text
    • http://zmz72.ru/files/file/pelazebexamojanewanaj.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_off0000caed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAED 10868 bytes
SHA-256: 6e238f9bcdfab86b9ddcb8e61e018bd8b639cdef467676ac41429bc35e43e976
font_01_sfnt_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 21244 bytes
SHA-256: 8633e8bcea5d296ea0d77530550ccb89a53dc3dd597d40dd769e720d9c23f7fb
font_02_sfnt_off00011ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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