Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbc289c896e0a03…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 17:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c02c32ab0652f4100608d260ffb99606 SHA-1: 0d64fd875c9595c24b001c9fe25746c34750a058 SHA-256: dcbc289c896e0a039793656a40898642389d557ef99ce9b9f8f726bf7287a98c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the URLs suggests a potential for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://catamma.ru/uplcv?utm_term=kode+genshin+impact PDF link annotation
    • https://triosms.com/userfiles/file/zesizawiruxodemipumox.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/96362183072.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/38131273075.pdfIn PDF document text
    • http://hidropro.hu/upload/vizerasubaf.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/bc64839d3ee0312af7f556991104b9a7/worujadixiv.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614123ddd2568---76257447900.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/24429358660.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/99393337834.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/38f1958hnl9qa555o1mm7vhe8s/85993489465.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/beriga.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140809264433---1564954080.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/56663746520.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/sunewukatumesed.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/natinu.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/xikusunitob.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/39865904093.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/24936672273.pdfIn PDF document text
    • https://hirurgija.me/files/19016929217.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/wegokavevamokedizak.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/begenegipazebukotenega.pdfIn PDF document text
    • https://mbbs.hr/files/ganowos.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/wigene.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/67097906239.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_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 17624 bytes
SHA-256: 4600c09015798aa9d84f98a78cc614f05426472e142e20d94a7e8964e48fb918
font_01_sfnt_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 10808 bytes
SHA-256: 30d8d178e9acb3b214fbed0f9255ebd6da0d0ee7a88322b3e68d16727d0c9bd0