Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc48d6dced7fbe1…

MALICIOUS

PDF

72.3 KB Created: 2021-09-24 13:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f52a880b8529d74433953b1a69b24b8 SHA-1: bb3d82974a7a74ff855205e6a27edd58873f54f5 SHA-256: 8dc48d6dced7fbe1099f4b22f9fddfc802923a8b7cc8b489cb5bb7ffe4d5cf42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://samsunyapi.com/userfiles/files/goxuzumofemageb.pdf In PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/benorarexenibolup.pdfIn PDF document text
    • https://socardan.com/userfiles/files/82250596709.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210915174742.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/zadabumutejuku.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/rozupoxiz.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/rozakolalufa.pdfIn PDF document text
    • http://ijiantu.com/filespath/files/20210920235639.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/bimuk.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/bojupitiputuguxugura.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/jarijememenugenev.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/28233377246.pdfIn PDF document text
    • http://elpijisystem.com/file/dogomogipa.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/93652275011.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/tawevafodopolapip.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/8535262854.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161421215ce2cf---1905451097.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/jiwuxiguvebegenoged.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce88756605---62127356943.pdfIn PDF document text
    • http://timocomputer.cz/files/file/5400616724.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/ffbb2c5ec3aa07be3613717b1a2185a3.pdfIn PDF document text
    • https://nexapos.com/upload/files/95120689062.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/e6t6ndj1nmio82iq47pm9abbrv/6039262370.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-3/20210903031406841675.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/74203321194.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090807200773499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=high+society+1956+watch+onlinePDF 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_off0000b611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 11124 bytes
SHA-256: fbe4a781daafa3f78a60cad51eaed20f38924424181e0531cd91962cf9d5b182
font_02_sfnt_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 16960 bytes
SHA-256: 00c2b8cca9933cc2deb817da8b8bdccb93beb0cb1384cc197b3c3eabad565f25

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