Malicious PDF — malware analysis report

Static analysis result for SHA-256 88db582784798beb…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 01:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f796d0ac2204ef0266647540368bcc7b SHA-1: 57ccac22989f13ba6ba5c16c03931f091aba5303 SHA-256: 88db582784798bebf95a034a72d54693c5b9b953908643bbb46e0e54cee33bc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the ultimate destination. While no scripts were directly extracted, the PDF structure and embedded links indicate a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://area5srl.it/file/96098493152.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21b06f5e5---69401316723.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/53818752428.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5b5292caa---36068323070.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/j66hurpo3jueoq2086oo261jpl/liveputofunozodake.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54e20f8a7---7119007129.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/8e713f3826f838d54851d86147c981c3/kosojujuvu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/325744540.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/32355701787.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5d607dc0d4acb37d0d2f0c67e366003b/78817232349.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/41838024860.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/pujulaxafuf.pdfIn PDF document text
    • http://suaups.net/userfiles/file/75752254877.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210731_C6F735F7E9E84AE1.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/sonikirasep.pdfIn PDF document text
    • http://foodsaver.nl/app/webroot/files/userfiles/files/sodidexaze.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/89447465773.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/020afcea4783a86ea93afedabaa105bd/revapulujapofogodi.pdfIn PDF document text
    • https://rintrans.com/files/97591825433.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/2260325193.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/68136238029.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/tevexiruriwub.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4fd19ccfcfd804357db03c47fd7290b2/79577338085.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9ttp15fb1a34o02cgjkotm1l4b/pazazejazewototarefuzan.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/siloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=stages+of+moral+reasoning+by+kohlbergPDF 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_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 17784 bytes
SHA-256: 5520f81c4487d40d40efcd8806b72634802f4a27a6425aaed390ac4467f50bee
font_01_sfnt_off000114a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A5 11080 bytes
SHA-256: a1aa76d180c33486deb9fa84b9a5002931d851e567b6ed5e74b220b1d5a21803
font_02_sfnt_off00012e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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