Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7df2055795dcb70…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 23:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d3241aa6a521d8f434df52d52e40ccf SHA-1: 8359a8a4ca30c3df0a4b7a1daeb9fe71c52e5d0a SHA-256: e7df2055795dcb705f0c00abc97522b20df9f7393238ac09046b0848fd23c0d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=zuma+bubble+game PDF link annotation
    • https://sportsht.com/userfiles/file/jejatenefefemuvukapaz.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/8067561881.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/kerolumoguvelofasisivuxi.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/53758256864.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/gutalol.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/17644231430.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/20607159057.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/vusir.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/pujuguwejunefezokuzabek.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614474da44da0---lamame.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/pekoromileroxaza.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c7988e9c0aea85bf0e1bbbf675f58128/fagawatuwukunanaxe.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/koxolomukujobawavomam.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/viwefofekutoranumujuju.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/dutijikudobi.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/9075095938.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/gubowax.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/jiruxi.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/xekuvetunenibiwi.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/walatiku.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/3i7953jbmfenkh8eqlr0696k32/858954094.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1ceb7c9e4---96906483042.pdfIn PDF document text
    • 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_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 18092 bytes
SHA-256: 5599303b39d634f7e132d0b567f3c105b4900676451e3d8471a2902cecabd26a
font_01_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 9972 bytes
SHA-256: 3a557d1282d12acf8676c9a740eb0e928bd12ddc20f6d2c322682d4fc38759ac
font_02_sfnt_off00011efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1