Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c7c5e840bb9f9f…

MALICIOUS

PDF

88.2 KB Created: 2021-09-16 08:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b59f77f9986b7ffbf236c6602d69c927 SHA-1: 20b5fc6d1de3615e872ec549d26cac408b942d92 SHA-256: 95c7c5e840bb9f9ff12aff46e95ad3ad1d3aa5683ad000346cf27484f42d240f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=aurelia+cheat+codes+android PDF link annotation
    • http://casinodanmarkjackpot.dk/userfiles/file/63651223240.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc0ca9382---69016665993.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/33952926579.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/pekozejejurosudok.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ba345e07d---moven.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/81227825687.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369dc212f56---70294078283.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/mijomomovuwitulubuje.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386742b1dbb---mifovog.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/meganigosepigopizel.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/wadusajafobezijoxa.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/filebatopozojapesalom.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/zodileralulomupiw.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/tabodawowowafur.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/tukidabujozegisili.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/sagivedera.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/vomowojenu.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/95128298335.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/83908890029.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/59084233593.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/54762389955.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bb457d67e---lorevojugajas.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/jesibeka.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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 10548 bytes
SHA-256: fc4e7bfa72684743b3bb44b648262f68dcef438a0d8a39cec2d9feacd2304b2f
font_02_sfnt_off000123d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D5 18084 bytes
SHA-256: a01600b8868be91de6c7886fe054f60e6586464de90bfb46a5f62cc31169f8bf

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