Malicious PDF — malware analysis report

Static analysis result for SHA-256 4904c68cbe3c28c8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 11:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e876816030b34bf4250afeab4885344e SHA-1: b50c4ba547cb975c13f7f1a23c7ad3462a740714 SHA-256: 4904c68cbe3c28c8d4ff6230ea101c5e15c780d39f7e92a9380a3b48de1a6cdb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicated maliciousness, and multiple heuristics identified the PDF as a link farm. The embedded URLs point to various compromised or disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/71okfcasudahcka83p7j2l7gfr/61064149389.pdf In PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02f1c518d---zojukiwexodupe.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/bakupepalofe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f88d00049d---79471658903.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/pupegavajomojowujilizir.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vimezonapa.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/rugelimuk.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/11984094063.pdfIn PDF document text
    • http://newcityhk.com/userfiles/bigodebetit.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/92793923087.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/44983316878.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/13343231905.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/26182319488.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/54280158037.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/56956547477.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/42701013864.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613113c1bdf8d---65530765243.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4b9312990ab60ddcf063ce5c63efc2ed/84619168325.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/rixadiradoxagararadif.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/piwozakarinimibugelofoxes.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/jabaxozut.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/78357145242.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/lulupimesajaxukil.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16141ffcfd83bc---tedafawazibuzowu.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/52488534666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=harry+potter+full+filmPDF 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_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 10452 bytes
SHA-256: 6c467633ccc63e6ab5ac6966a2c24ecfbf81aadece4a9fce1d16ae82e7fbe577
font_01_sfnt_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 18104 bytes
SHA-256: 4111a7d0608210f94e8232ffb6031a449be37357e1fd2b7b9aac14a22da138bb

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