Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7fb686cec3d928…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 18:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08ea6c56fc1f9d02696b6eb7266711a0 SHA-1: 654d5a3e4f63e8b731c7cca8540879577f995ecb SHA-256: 6b7fb686cec3d9280e1e74e317a0fe38e10de06ce62f8735e803e7b297daec75
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions or redirects. Additionally, heuristics indicate the document functions as a link farm, pointing to multiple compromised or disposable hosting sites, suggesting an attempt to obscure the ultimate destination and evade detection. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mothertheresapublicschool.com/userfiles/file/16770098152.pdf In PDF document text
    • http://sillajen.com/fckeditor/_upload/file/1285562267.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qak8qinnkag630kokl1gkis159/15787848353.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/foludobiguk.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/25135184837.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/nokoralukurudodokadubut.pdfIn PDF document text
    • http://livestocktool.com/d/files/xuminuraguxafonozofapu.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/dosobukopaga.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/61380277024.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161149b1c976e3---baxuzolizipadaxexegoju.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/lapitirugiwesatogawu.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/fuwowipog.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/mabesewonewedanixizuv.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/moduvurasanizew.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/sixasamadodilovevesogab.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/gifumodegelalipidifevuvo.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/c5uhqb8f0qknti50jjv6fsgq2o/lomokenelexugolonapab.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/zatazemosigaba.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/xejufajemixa.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/jafem.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/60683127922.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/xalixuxofavebalo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/384badcfa36f9e324990cbecf7c267ba/suwudenapavo.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/9c901mqi7o7k0o860ut0b43l33/fubozudotijewupege.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/52888514565.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/51380c07a85e565358da57ceec00bc25/15174257636.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/wukijoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tnpsc+group+4+syllabus+2019+in+tamil+pdf+downloadPDF 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_off0000d5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 11776 bytes
SHA-256: 5b98116aacde04ee7c44dbec9a7eef8c81bd4da5b170353f5b5fcdbc7885fba8
font_01_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 17440 bytes
SHA-256: 45baf34d4feee87d43c73beb1d686f419d96848d95fa76269dc1c8189eb190e8
font_02_sfnt_off00011eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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