Malicious PDF — malware analysis report

Static analysis result for SHA-256 282be1e97a2a2d0c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 16:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f7dc296f4069442bf1f4442f479a2c29 SHA-1: b0a79149ca535b097e2787edfa500040c9302fbc SHA-256: 282be1e97a2a2d0cae35bb7260ce07ad26ee56c9cfb682937917947f4a3e9745
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, a technique often used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/993b696b1e1df1f3b5785f9774043b3d/11859583527.pdf In PDF document text
    • http://szao-spb.ru/images/news/file/mirelu.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/9so28e4bv9br5sact3kcr3dkv5/sufokisalemosedev.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bb7fcfc99---5368931657.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099e607b7ec3---74737681081.pdfIn PDF document text
    • http://bubb.cn/up_file/file/46807020643.pdfIn PDF document text
    • http://coatsofarms.com.au/ckfinder/userfiles/files/5199780423.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/40997866443.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a1877bec4f---sirubujilulewapesetiwiri.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/50476467880.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/bupeladizobulebonel.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/56882538774.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/cbc4819a47e840b933f8abd4f09712e0/fofudoxoj.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b5a336831dd83dd8697c1d345afc29cd/xupixizipovibofedep.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/jilelenoxafas.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jldpp3plg79kho6brbev5si2pd/58579404530.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/bb42b6d7998c538eef1f35987f09b111/91529204233.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/vozigewujulotopitofuv.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/vunusewavisugutajineni.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/46619038218.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9d901ef61233ddc60053a0de4ffcd3f3/17921009761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=most+powerful+mythical+creaturesPDF 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_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 17708 bytes
SHA-256: b39cf9e10744bba4b89b1257d67d463fa502af542ca4b628361e27962530d454
font_01_sfnt_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 10932 bytes
SHA-256: c32e4e81ab6dd9dd7bc9bf6e774832fc9dd51242b3825b428b5d213f0b784a26
font_02_sfnt_off00012868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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