Malicious PDF — malware analysis report

Static analysis result for SHA-256 15aae8beb23523ae…

MALICIOUS

PDF

92.2 KB Created: 2021-09-16 17:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5da468c89acc32ed4fbc26e44a057a0 SHA-1: b83eb3339733bd7b1e5b7744f9093a276598d474 SHA-256: 15aae8beb23523aed0297efebb8eae85d7699b89d706dd1cddd9914dd524d463
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains a link farm pointing to compromised websites, likely intended to redirect users to malicious content. The malformed stream length suggests an attempt to hide malicious code or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://fantacyhandicraft.com/userfiles/file/wimixuwobobedo.pdf In PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/40186052298.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/xuxejafivez.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf757d6fd---301128798.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/87720397749.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210916052712.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5e0a3414a980ba61c6a7986e59f29819/84415310217.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/83480054586.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e7f065bce95b85d139552cf095c18df5/kupatojovexefi.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/62760655727.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/tepigekejipowidipirebow.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/51748938131.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/14666705977.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/tawiruvidupate.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/95280289743.pdfIn PDF document text
    • https://successalpha.team/upload/files/96947986366.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/15711154092.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/97246431109.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/pemuridulakikixuxoro.pdfIn PDF document text
    • https://equimat-cheval.fr/file/13303786988.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/zakuwo.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/sewogawotupulit.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/10530350675.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/15591046583.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/12904150186.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/86018443456.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/muvolalufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dune+buggy+gta+5PDF 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_off0000fb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 10248 bytes
SHA-256: 9e128a4a63c9d5c2f91219dbf500d46a3501bb701e74b8fad6205e294d882899
font_01_sfnt_off0001124f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A61 21356 bytes
SHA-256: 878bcf6a7d28baffe6994529f984b4095a2578c7b30c2f587b171e45b934744d

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