Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a500f1606eb32b…

MALICIOUS

PDF

111.2 KB Created: 2021-09-01 21:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f6f8ac26f4a142ef6315c34cf736ba61 SHA-1: 823c9f428a59a33ba70e829e602174b39fcb2a0c SHA-256: 82a500f1606eb32b159b233c0ed282183eb434084386265cba5ed2fa3c572a56
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of these links suggests the document's primary purpose is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e688959d820---bifimenek.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab7fd6189---41161211225.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/58922418207.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/88884987767.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a3601e6c---17881602759.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/pozufosujemarig.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/78rjvjjl2743cmob9r27ft80q4/dixebirabosasew.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608168ad9e3ed---89394763216.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da53687145---wageniwijemewutegadifil.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a1d57faf0---lematerowelodovunixusa.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160785a6bd967f---94245896242.pdfIn PDF document text
    • http://hanifeugur.com/image/files/68788926813.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/dipubotif.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/97236730222.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/fomaviva.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/15528251362.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160838eb36ed14---xoxebobewelevuwor.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a1e76cc51e58c2d2c799ff28fc340f66/xetubejinosojo.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/8225323772.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d5e5ef37d31c8eb9c425f213b08c811a/figuk.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/26821464297.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609de26605207---52911048661.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f3d02432---nofisezanirunenosed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ron+harry+potterPDF 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_off00014bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000163e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E9 20048 bytes
SHA-256: d22038e11842f9ca4deb36b24d6df66e01b2b816a2ae12f4206c91a6580cc24a
font_02_sfnt_off00019827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19827 10204 bytes
SHA-256: 34a20cf10d2277c2642bab49372a4766c34c2c01c904336b0ed2d01e837b05ff

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