Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b373aea55fa6b4e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 11:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a538f86306318d9a5cb67fb8cc6b4c7f SHA-1: d15741e962f6196b03a32f9799899e0f3dbace7f SHA-256: 8b373aea55fa6b4e0397fe76081932868ad7998e8c09c9d5d9a4ebacdcd03928
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a QR code lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/46025135422.pdf In PDF document text
    • http://lmtechsolution.com/userfiles/dawitemazodu.pdfIn PDF document text
    • http://klaaswester.nl/img/file/vawusurudasupavovet.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/5106835431.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/wejivaxejenebinaza.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/73282584989.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/gumipuzosutibobumixakuwa.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/97703537872.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/64206706259.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210903160451577.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/sanelodajugoladaxoxapezu.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/50491831464.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/56489567450.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/fujoweromozatuvajapej.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/vuxavafuloruvapoxafumudun.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613719b9d5474---77053247960.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136b714dc8ca---93826856950.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/nawokukebone.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/lizatiletexakotixu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161368eba596cb---xobofekero.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/kaxipixipunoxepezin.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/vemokujifugofinap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+find+old+wifi+password+on+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_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 17864 bytes
SHA-256: 311576693f85c296c6b693b3c07bc57b9c246f21a49c22a1cb4a3086bb06727a
font_01_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 10436 bytes
SHA-256: 57be5b8e7d1dca2788f929c69fb6e74e37584a2de372e2b6ce2ca3e951299c9d

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