Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c60a1221f4cfce…

MALICIOUS

PDF

89.3 KB Created: 2021-09-09 16:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82f361f2d9ecf4052bb0a42f0063b4df SHA-1: 3815ea6d693a3460458b15aae264189a1c836763 SHA-256: e3c60a1221f4cfce6aa207103c3f7c3806c517f6e5579ae64e85f440b1de85a9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external URIs and is identified as a link farm, likely intended to redirect users to malicious content or for SEO manipulation. The ML classifier strongly indicated maliciousness, and the presence of multiple compromised CMS upload links further supports this assessment. No scripts were extracted, but the structure and embedded URLs point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=selfie+queen+mod+apk+unlimited+money PDF link annotation
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/wobiv.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/mexuvid.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/lukiriwi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613276005d752---76073595669.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109010924081434.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/nalitobog.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4t361gd01a8hi9jhmc21bmhdva/muvoduxodevipolekogoj.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/78384621294.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/dezafarujovukiwinepo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lovopabumejirikabi.pdfIn PDF document text
    • http://medi-sen.com/files/files/68816476073.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347213cb7d4---dogosenefipimidovimarub.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/34663354776.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/kanogukugiporosudujutog.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210908_4AAFD400A08A37CE.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/zufalumavatefuvemusinet.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/gapojejex.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/xafubifo.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/latamatukorazawo.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/91572038483.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f075fceb24---73018305253.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/livufimisiregekumiva.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/80848729366.pdfIn PDF document text
    • http://mega.kz/media/upload/files/puzavufanedekozizasidofe.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_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 18380 bytes
SHA-256: 39ec10a9b7fcc514cb9d6f78b0f69655d5ab931f9a29d06a3323be1597e57bf0
font_01_sfnt_off0001266d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 10920 bytes
SHA-256: 79a5aac06dac7de2ffd4adc3eb1f59f2558f0ac2a9e44d9472340987a080f14b
font_02_sfnt_off00013f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1