Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e37f107e66e92d2…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 04:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f40dff965fa23e625f72d65da94aede SHA-1: 3167cee34d2d6c54dfa39f820cec15fa9065a597 SHA-256: 8e37f107e66e92d2f330f4522e6eff20aab05ec9604b3f1fe33f7006ca348b26
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to other PDF files hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload via the linked PDFs. No scripts were extracted, but the structure and URL patterns are typical of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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://yh-nutri.com/filespath/files/20210905075151.pdf In PDF document text
    • http://phutunggiahungoto.com/uploads/files/libemuvepiluzirusavu.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/vujolosanunujufokopototi.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210918122222485.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/45693027593.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109062105549910.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/8913da6099e096c29188ef51b1dfb5f1/fevuvedez.pdfIn PDF document text
    • https://pspgenuine.com/ci/userfiles/files/28487008397.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477ce4ed8a9---58127011948.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/xaxuwut.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/luxuwumazujesudinunadip.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/wivelorujuvamekuwosisiw.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/33268591064.pdfIn PDF document text
    • https://fratellifurloni.it/file/36509537575.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/69246690363.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/75032617447.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/90865308850.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131da1f91f4a---tikurekudimow.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/vewemetedo.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/betixuxib.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/xozilojuwevimedemedek.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/fumizeditujebor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=5fm+app+for+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_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 10252 bytes
SHA-256: 510cb3fdd9672ee4061354741c4357db3961c7d05651f5fa9e1ef9c18811de5b
font_01_sfnt_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 17452 bytes
SHA-256: e65e7ec2230711d2b110d4b902081b4657cb16dccc43a598fbf32cea2ccabf2b

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