Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73e441f5c4d7350…

MALICIOUS

PDF

98.6 KB Created: 2021-08-22 06:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17c295965e8e985939293b53f8536364 SHA-1: b827f8ca208e9989d111234ee4c228d19cc90570 SHA-256: b73e441f5c4d7350e64d08070785afa512d6ceb6ec5a883b270bb5b47fff227e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The 'Payment Redirection Lure' heuristic strongly suggests a business email compromise (BEC) attempt, where attackers impersonate legitimate entities to redirect payments. While no scripts were extracted, the PDF structure and link farm behavior are consistent with malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ambient-interier.cz/files/files/20452114517.pdf In PDF document text
    • https://realxenon.ru/uploads/files/daruwofojularolunuzufubi.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608396acee2cf---92277080711.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/61035675231.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/zekuxosavozoposoxirok.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/32997547669.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609444e822a32---jupogatobi.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/20285499250.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/j5t8cv6sjh45bmbl7gbl7qr78g/pusigiwelemalonakijisaj.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/66080662927.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/iflgq056oabcn0diqc1qncbq1j/84962528414.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/samodidojamoruzafakiko.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/fujolosejenafererur.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/nugikopubatadekuku.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/10527181882.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b760821f1---98759713167.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/xiroreminejefidugutizi.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1ec68nm9bp62es7l7is05s3c04/refalovodirobodo.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609efbfc4528c---79346608349.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d097707c38476bb1609360957c4d7ea8/94111765543.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/93814600256.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5ac6be4b95efd1f606c5d4ea6b90cc01/lutebenefosegexameza.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/tuxizifewod.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116520207679---jaruvixojuwatukawimaxuxab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sbi+sukanya+samriddhi+yojana+account+opening+form+onlinePDF 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_off00011c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C22 11720 bytes
SHA-256: dbab6b49123567efcdb36a8dda80a81d4798ba21265a6fbe6585de41712a85f3
font_01_sfnt_off0001376f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376F 17112 bytes
SHA-256: 44d4c2b12336866bba3a901cbefb07965efbd3b95bddb2de9cd9ece96e893bd6
font_02_sfnt_off0001642c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1642C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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