Malicious PDF — malware analysis report

Static analysis result for SHA-256 9533cfeff97e5e2e…

MALICIOUS

PDF

90.7 KB Created: 2021-08-08 11:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3b04c0c6274a72214b3116e83380a5c SHA-1: fb462012c8eb09653de72d41daba52d9de62bc67 SHA-256: 9533cfeff97e5e2e3c24373c0d3590f56c278723d9bce432fa82adfafa906a1f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate a link farm on disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f972e393---jibinigofifevelanosenep.pdf
    • https://hijaustabilo.com/contents//files/makif.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/33b1f81d9c6334caf5626a0651d88897/45713993802.pdf
    • https://soccerauquebec.com/userfiles/file/6553545468.pdf
    • http://marymo.ru/uploads/files/toxakiloz.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f548da4727---xomukoduxani.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/642b3540666f6752bfb454f93e05e21a/99043776695.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3080c1f2fc---940351341.pdf
    • http://liubeauty.com/luutru/files/nidokufi.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e2ecbadd3---27242270283.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8f480721f---31819939693.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/53608777657.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607444faec9d0---kuneluzokonipizolu.pdf
    • http://www.moyekolodin.com/files/56450163546.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/fd7a2c7103a2bd77bc38e57e7830ea26/gamekigitadon.pdf
    • http://matsonconstruction.net/userfiles/file/kuxomonevovezovelowusalo.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606effc142161---64421919897.pdf
    • http://ya-ke.cn/admin/upload/subazuvazafipu.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a89e04f3c---simozom.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6dc5ab9808c2c2e1f2baf0d9c3499999/35886740272.pdf
    • http://andlupa.com/userfiles/file/43587364743.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987edb8c513---3081819677.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105fd634339a---63298897506.pdf
    • http://ginzaoakland.com/uploads/files/79810765804.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c866ae8a33d---dosodosedusamegixokewak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=el+principe+de+las+mareas+online
    • 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_off0000fa9d.bin
b16eaa4589d717dd3bbc142da0320df49ea19261d7e8f9a44a99f3b8f378f252
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 18588 bytes
font_01_sfnt_off00012a0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0F 16792 bytes
font_02_sfnt_off00014226.bin
7019081243659358fdb421ce28a659d21ad9f62dfe07c3d60e97b2d04371076b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14226 10560 bytes