Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d8c492f37f6477…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 04:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b3dc3317a27861f97d37a472d4b2792 SHA-1: 18e294b43a735dc44327f65089685e61732c49db SHA-256: 97d8c492f37f64776b04924d3f4e2433ec0fc3066b7ff50dd80d49aae9408f03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or malware delivery, consistent with a spearphishing attachment attack vector. No scripts were extracted, but the structure suggests a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c1120651---88476606424.pdf In PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078e903236e1---xeduder.pdfIn PDF document text
    • http://kfbi.ru/content/file/89219084202.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/segulugewo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4074d94004---47534958451.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/aebcfaecfafd90e689e67e4b56674337/guzigevitokofadibadiriviw.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795d1fd3c01---62230922840.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107bdc1b0f5e---77312495834.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/makubukowobovinejazetopi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fd4bd5f7---sigebajapibizezubigo.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127091357f5a---7797148061.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d40eda61f1b---42895397691.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/7ijajrkkq72p8pvmaujm7q3fv1/gagig.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/9898311382.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202108261704412152.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/fizudoxikipabakolopiv.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/loteg.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/lavebopi.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/160759050.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1622453743.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ee33ff80131---mevat.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/97649097237.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/62713603194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=voltaire+zadig+english+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_off0000d672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD672 10808 bytes
SHA-256: 44f537d24558cf3a252eaf15949813b9d8f0f31c8674ad6648570b93d7251a18
font_01_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 19360 bytes
SHA-256: be018293f4cc9afac35a9e7de91aa9e71e398ce3c984bde4348a96aaedbe472d
font_02_sfnt_off0001218f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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