Malicious PDF — malware analysis report

Static analysis result for SHA-256 9087b4ff2a6acd16…

MALICIOUS

PDF

92.8 KB Created: 2021-09-02 15:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2019db5ef7dccd4cc3857bf3a25ec93 SHA-1: 612e86912f9712466dab3fa26fb95c2ed3c2401b SHA-256: 9087b4ff2a6acd16b52c009427ec733ee80871ff6f30613e6b5e7a72477a30e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains flagged as link farms or hosted on potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these external resources. No scripts were extracted, but the structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dewalt-naradi.cz/media/upload/editor/file/98742072792.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a3509291653c1e4aa684e5fa36f50801/65158217760.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/96098913815.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/xawimawemigizanerodobivis.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/wiruxodexonoduw.pdfIn PDF document text
    • http://com123.vn/uploads/file/91223047022.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/roriwumuwireke.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/duzuxavowa.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/19814084753.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/nominufedurisotonok.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/31310500818.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/zexuf.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/vifojuwomolagerobesum.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/tajopavobises.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfc221c172---bavofujapox.pdfIn PDF document text
    • http://farashimirooz.com/files/daveketi.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/je9tmarfveed45brd6io8o1arr/supifejinejurosero.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843ea3d7309---92746006459.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/91992589214.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/zidajotikegenofedoti.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202159218562852.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/66616650898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=basic+immunology+abbas+6th+edition+pdfPDF 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_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 11544 bytes
SHA-256: efc636f6090950b3a17c8dcfee7b065794b7d969a54c19d896b3be60cecbc967
font_01_sfnt_off00011aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 19420 bytes
SHA-256: 279347935e829331c3d14d890e59147290b7a2685a93235ba68aedf8cdcfe9e3
font_02_sfnt_off00014d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1