Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85e4de8a73b10af…

MALICIOUS

PDF

91.4 KB Created: 2021-07-17 05:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e8a5a411b5ff8fa1e03033a7296bb05 SHA-1: d94eaa471cb9752c319a867609b0eaf3eac1e66d SHA-256: f85e4de8a73b10af038145a20cfbef4ed6372c6333ed83fb6464e30b720b0260
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a lure to redirect users to malicious content. The presence of numerous unknown URLs suggests a broad phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aafd03f2c1---zasavivude.pdf
    • https://uleshuzatabc.hu/files/file/74556108093.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071f21b1eeaf---wedoroxemufe.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9018cde9---sokaliluviwanor.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077af4f57e5f---lojozenekip.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e0b97f3e---85236710496.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751985e9f45---58964755036.pdf
    • http://ac-kenigsberg.ru/files/file/9804792616.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb626ad05a8---80321747813.pdf
    • https://semagro-msw.ru/pics/images/file/29147271865.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e1410c1c8f5c2a7aa5a2b7999bd79d42/27312075268.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/61740309357.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/616ec7e39243d947e93f1112e8d606ef/fiwuzezofupesijizeb.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d2658ddb71074cbacdd733add5851641/12465976995.pdf
    • http://brandnewgoods.net/userfiles/file/bagulavolewunizo.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/sunojusijotatoluva.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a171c97038---zefokibujesulow.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/deaba3m60kbgbuonqh8s0a4lil/19458050357.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/39868128675.pdf
    • http://sakuragiramenandsushi.com/uploads/files/75294628990.pdf
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/92667266816.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607290105cea0---28327534137.pdf
    • https://zweefvlieg.net/userfiles/file/nasebazedabosaxuvunute.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=1+cup+liter+conversion
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010396.bin
c7773a31fb186d3f271fe9437895ad085f0f9ba5a574ea570d80f7ff675ddc5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 17372 bytes
font_01_sfnt_off000130f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F6 16792 bytes
font_02_sfnt_off0001490d.bin
2e7eaa26c754ea9ef9d3bbc2b248d0293edcfe6dc94843bb88c5df04651535ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x1490D 10324 bytes