Malicious PDF — malware analysis report

Static analysis result for SHA-256 88faf41beff456d2…

MALICIOUS

PDF

71.5 KB Created: 2021-09-23 01:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 434519f890c1b53a7c2b779c00f9023f SHA-1: f149aa183208e2c247c26b4ee8e5da9f74646c74 SHA-256: 88faf41beff456d2b91b8dc56e9f89d6fb6decfbfdacf40ae118024cc8ba376b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or to distribute further malware. The primary attack pattern observed is the use of malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://schubert-hh.de/image/file/dawevumomadekaxuvu.pdf In PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210917_B0F448F4B905ABB5.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/bagumexujevodiw.pdfIn PDF document text
    • http://unsersohn.ch/images/file/85582710433.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/87177728622.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/jaxixuzujeruniw.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93be9f766---salipafeditarafew.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/lojunewozutibufe.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7c2703a576683cdfcc24d3ecfd783736/14745399984.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/87114336939.pdfIn PDF document text
    • https://avela.md/userfiles/file/tebewarusedipekuvamo.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/senikamelis.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/20637182693.pdfIn PDF document text
    • http://julianina.de/upload/file/87744481764.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8c4964075762eae91271088a20d7133a/lekafamokijabufuz.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/37304750018.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/jodesaladusiwar.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/7494038d05039d83e79efdbc575aec88/72001919133.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/nimewa.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/taliwefukuwunamupa.pdfIn PDF document text
    • http://micruts.org/userfiles/file/bitujerozefuzogalipitu.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/42783764299.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/noxatefubes.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/30333763190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+an+heirloom+carrotPDF 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_off0000ba7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7A 15096 bytes
SHA-256: 70255fab31ecbfadd3708b0c1e02f11ada1db2f45f5306a2ff45f4f642e8909a
font_01_sfnt_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 10488 bytes
SHA-256: 764d60b0c46e140f4c40898e876f45dc45c7afba9f034ba8ad78cc2d2f15b393

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