Malicious PDF — malware analysis report

Static analysis result for SHA-256 92023cce28fa63b5…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 00:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7164728a2b906ac2f314c649857912c9 SHA-1: 6954ad837c9c27af4f39a549ac6834ace7ca9c08 SHA-256: 92023cce28fa63b568b8392fe4d185cd55c2df80a1faa755a75c8434efef4ddf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The 'utm_term' parameter in one URL indicates a lure for 'free robux', a common tactic to entice users. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://malabarmail.com/ckfinder/userfiles/files/90096829649.pdf In PDF document text
    • http://birdwatching.sk/media/file/69397727284.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12886486074.pdfIn PDF document text
    • http://arsvet.ru/img/upload/95153725439.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/03ab66f82faccc49e61155161b3c0711/60119287763.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/6491830731.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/12258838750.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/pusokuwikeleripo.pdfIn PDF document text
    • http://wdnederland.nl/file/fixuropefedirufok.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/51831339620.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/45135408766.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630948132.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/91927665790.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/46749936619.pdfIn PDF document text
    • http://altinay-law.com/images/file/44028148254.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109120936384308.pdfIn PDF document text
    • https://ubranni.com/uploader/files/12614461993.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/pilejonejedojip.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210904091844.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/zidejitokuxigizudel.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161425852d2f75---jekumojusanorolabop.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf5a31bec---pukugijaj.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/40345015752.pdfIn PDF document text
    • https://tmtteks.com/files/kefipimovidanimonurifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+robux+obby+2021PDF link annotation
    • 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_off0000c2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 16068 bytes
SHA-256: 6e7e8fe528a5fa052685bd8b7c23cfba3415d07af297cc8f4c1a2044a794a39d
font_02_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 10156 bytes
SHA-256: 2750e77e95d75ae5637c3825ebd70aeed2e5aa858f78de7a50693dacf767fa07