Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5db1f5866d90051…

MALICIOUS

PDF

95.4 KB Created: 2021-06-28 10:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0d28c81a995583b66f8f5b9080376622 SHA-1: 71a1d8ff28c65716b65a6e796c00c5b6645acbcc SHA-256: c5db1f5866d90051a97d27ebd81614ad2c92f0d277a828cc2dd0b0d190bb96d1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains lures for advance-fee scams and fake invoices, aiming to trick the user into downloading a malicious file. Numerous URLs are present, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cructi.ru/uplcv?utm_term=naturalization+by+marriage PDF link annotation
    • http://dansecyr.ca/pdf/file/lebekope.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/97ld2886duqep3fa5ca2s0cik5/75433894054.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/vexonoki.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/62870632434.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/36091877715.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/64349701315.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff1c19312---xenakegix.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/lusesi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2df406f8bd---26857270316.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/rutedurukuratetejozozugiv.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a20e69e0c---62043281203.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/8a410e572e24b7be2f58465c8cd4acd7/manebifiwi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7c2d5e8e9---jotewefubiduwokopogolaxis.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8131089d---kebidavuxanibopafuban.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/39134721359.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072c283f0d4d---3636044890.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/fefujewetabuf.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fc3c2e2cfb13cda9a304e26646149944/wepujolarojaw.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/44998213319.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160d3118120ec7---davilisapuguxikivofi.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/83272986361.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/wijekisonefusesenilew.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/kaduzesuk.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d668e9d98---22333448763.pdfIn PDF document text
    • 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_off000113ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FF 16896 bytes
SHA-256: 0eb32ae9533bdf587d01bb2cc84c187d6e98c4f562d067530354e040da13fa56
font_01_sfnt_off00013fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD4 10672 bytes
SHA-256: 40d4c2fda9174d708a68a2826c0a6facabc9cdb93e0fbf8d71240ee894f0f801
font_02_sfnt_off00015856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1