Malicious PDF — malware analysis report

Static analysis result for SHA-256 d346de4dfa64524e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-06 10:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5cd07e82f92e0f931dcf7af7af25bafa SHA-1: e1334ace4c2d3c1818a2ba27257cf1b1640b4837 SHA-256: d346de4dfa64524e0f56db1c7bcdb44d6dff4b12203709e1674781bd261aff18
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content. The presence of numerous unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608b200ec7809---japixaperegiko.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3da9232630efefc54e190b3caecdc4bf/zepuzazasinipax.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/saxonegivatopuniraguwek.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/b5883362cc98aaca7c8838fbe2a85a03/pamame.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/xegak.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9ce7aa321386cfb6ad62554bea5b384c/digolonufegovuku.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c92dbffa0e31efbceb5c66ff700e7ea7/90861799369.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/zuxomisudukijero.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/48078070728.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f846a2b12c6---lebadoji.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608126d7f4111---81291501335.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/34740703723.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/doxepozodejejifonabebim.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0960ee3ecfec0ca28fcb313b49e2bab9/42211815157.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/6964700831.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/sibizuki.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073db93332d8---bedelinejetuzusaliweruz.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e3dedc506---55086260595.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/84932973952.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607508d668602---jurutitepawikef.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/87120812775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fs-ia6b+receiver+manualPDF 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_off0000b629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3B 15944 bytes
SHA-256: 9024788cf3b271c6e1cf1d3ab52704d0b85eb57bd9fa62a027ab479bd1b34f48
font_02_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 10656 bytes
SHA-256: 1ab2e51a2298ae5e0c887b2102df7025b16fd0ee402b1fd1380c278a5801afc9

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