Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdd8f99de9a253c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 11:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 007e4a680d5f7e811135127cc18be05a SHA-1: 53f477a551a2aca0afcd3143d0ecab57cebdbbb8 SHA-256: 5cdd8f99de9a253c93d06c1f7ebc06efad9fc88eebea761b1f30a29ecdebf670
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://philabc.ru/uplcv?utm_term=free+psn+redeem+codes PDF link annotation
    • http://vizcsap.hu/files/file/nizuvojenigutefotovazu.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210905202738.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/xisuj.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/tafujonenerigodonaj.pdfIn PDF document text
    • http://sin-hua.org/userfiles/fulotusija.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/dadilisez.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c56901dd7b0a421d712a377e9b2e820a/jofojonul.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/60531748208.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/60044629067.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/64326642935.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/30750615841.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/77086434745.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141699820267---37871359343.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/93462785914.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/83428188107.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/nikoruwudo.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/35440419070.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/jusagusosimasimalobaves.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/diibq6qorjikugs37blchjelcu/lobagefuripekudive.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/63412790512.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612e9934cf5ac---81919175358.pdfIn PDF document text
    • http://pi-consulting.ch/download/dedobaxanisisoxijamegodi.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/7324331790.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210901202351_851402182.pdfIn PDF document text
    • http://didula.ru/img/file/debogawigizasarunirobiden.pdfIn PDF document text
    • http://cudicio.it/images/file/tijepixefevev.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_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 17740 bytes
SHA-256: b7f0f7bb4288f446f1b21b74691d6dcb0390b920a6f12347acfe76571380750f
font_01_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 10256 bytes
SHA-256: 2f5cce6fb1f4657b70618ad1eb2c54facc3cc8a8f8411d6b5d99e855d626b36f
font_02_sfnt_off0001105b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1