Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd8bec39bb18575…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 23:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b558a23692c24c478934aff13d901f39 SHA-1: 5b412aa5048a4abafb9468539e0f4f2e13293fb8 SHA-256: bdd8bec39bb18575af4428e1c97bffe11e17ea6d525917a124b7a483122cc4c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to other PDF files hosted on compromised or disposable domains. This behavior is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/uplcv?utm_term=samurai+1+vengeance+apk PDF link annotation
    • https://nepalihemp.com/ckfinder/userfiles/files/xosusajivekodekepako.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/lurutesisuzubuwujuzikem.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/661162447613fb362dd483.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/raxegametananazijosurak.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091402324573499.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/vusodazizejovaku.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/7q2ednqt19eqb3k29efp6lp9it/84782973449.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/sabopewumubelazivuniv.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/jukafanabovaduxulituven.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zeveli.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/93607613114.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/56426572454.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/47963111767.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6c95e15e9---dubezofinojexajerulo.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/muwuzulenemufovujegun.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210912_F86CC3DDD805D647.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/31865096879.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6e088d51606eeff65edf4fc15f40dbc9/pojawexig.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136e26568ed2---dazukolojotexozonatusabu.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/49868110206.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_off0000aee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FD 10672 bytes
SHA-256: f0b9b6be5c3a18153c938dd2b92e26762ad98445708b1d0a110388df6f44e93c
font_02_sfnt_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 15544 bytes
SHA-256: 73109042ea13e974e8d49983653b807b64ed50429e839f31db767f0e16d25786