Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cb03e46fa6c12f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-28 06:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a65c061fa27bb230869c84f4907b474f SHA-1: a37346e8315966c8b4481dfcc7790bae0a84affe SHA-256: 17cb03e46fa6c12fe714252b82382446e37b716498cfdcfa3dde202403b76e6c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier strongly indicated maliciousness, and heuristics identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the URLs suggests a potential for redirecting users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=best+ui+software PDF link annotation
    • http://gopherandsquirrelcontrol.com/admin/images/file/gimefosewejefasasixe.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/deripuzo.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fea329209---ramik.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/fonigabusewutonavafozegi.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/18035968493.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/32691965132.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/gazezunitujesisakos.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/98282127129.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/nosepi.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/55435110210.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210926091750.pdfIn PDF document text
    • http://erpos.sk/data/files/wimuw.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/jomolovorafixumejolu.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/tunebefewaxonula.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614317622c414---35058015482.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/92559688155.pdfIn PDF document text
    • http://poultech.net/d/files/bedigokifikutejexomozi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613548fe66f7b---susimizefovoxikudomegare.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/88205411784.pdfIn PDF document text
    • http://labsshop.com/d/files/23686987358.pdfIn PDF document text
    • https://softnettechno.com/sribati/editor/uploadfiles/67698795383.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/60526273542.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/duvosagijinikejipexibere.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/33151837419.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/jawop.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_off0000b8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B9 10296 bytes
SHA-256: 3a7a45b12249c5b00684536da2a7b8a87d608111554062b31b3ad487f20f4c93
font_01_sfnt_off0000d037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD037 17724 bytes
SHA-256: 3585c7b3da207b29feceb86948b9994a17aa89a60479e567f6df44fb0618c404
font_02_sfnt_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1