Malicious PDF — malware analysis report

Static analysis result for SHA-256 49735f27d3648e04…

MALICIOUS

PDF

110.1 KB Created: 2021-07-19 20:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 29209815b088c60e29b25bec4ca04bba SHA-1: 52678146a760f246f535b042d7ba6f6e74329a27 SHA-256: 49735f27d3648e04ee2729fc9b533e49ca6072e4fbc91c0e3981534c456fe7e0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://attack.lt/images/files/porexosokimigixekavo.pdf In PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/dezolosuzotolunavutul.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/beuklpmlvhjpr8pkiqrdpr5eef/tifokumivaxusawifov.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021060502450773499.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/cjusjdokn4hn8ffolbdlaja97r/wofulinaxijuravos.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/xadibijawaxijotinoluveti.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0a6d094a---85231700874.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/fopuxatuwiluvamaxaro.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1252144896.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/duwotik.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8b9374562073b2ee6d511f725f212c2f/lezifu.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/64980682493.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/kenenep.pdfIn PDF document text
    • http://africareview.in/userfiles/file/67080302155.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/zugivo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e915a7e3432---99831266119.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/eqdqmpeisonv6lam9ggf556be8/26472774850.pdfIn PDF document text
    • http://maxbrio.kr/files/files/xomakojadijilewubexima.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080f25f7adfb---95350107186.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/59740480798.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd8ddbcad---megudadoxufa.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/wutubagabozugewavago.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/46843020759.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/tasubiwerapudi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2e7fc925d---60336589941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=oh+you+can+hear+me+cryPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001117c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 10328 bytes
SHA-256: 22c7c4349b8dfacce6d1ebab98c0f7fd97f8838ddbb3a5a09b03a89512d75c67
font_01_sfnt_off00012896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12896 20376 bytes
SHA-256: 4677ebceeea7642f86aa3d51f7545c1bf0e857a0381158d184ee3632c1dc8bbd
font_02_sfnt_off00015b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B80 17916 bytes
SHA-256: d5cb8964063c71740e90f42dc06b24a19a7feb428e953e760408cd999bd4c5bf
font_03_sfnt_off0001929d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1929D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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