Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e56a8712130d8cf…

MALICIOUS

PDF

90.4 KB Created: 2021-06-26 14:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efe9c52b07f5405d4a4ac3e76253d368 SHA-1: 5df9dee3822165b8c351d64191f0b0336267ad04 SHA-256: 3e56a8712130d8cf89a0baff34275c02502869f240c598a7a9ce1292f514b9e8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure itself appears to be a link farm, designed to obscure the ultimate destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://arunimaflavours.com/userfiles/file/jodatufofe.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ulu5v28e6hp7e7p9d54s22jm33/kadafav.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/22024089814.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f441446c---66242751637.pdf
    • https://citytrafik.nu/images/file/42111544696.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4eb2bd8b8---vojesizekupinu.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca7a3d2c02---94410114894.pdf
    • http://pajurioverslas.lt/ckfinder/userfiles/files/gudofuxamewaxup.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d00ab09667d---nogigalatekikumepub.pdf
    • http://jnnycc.org/userfiles/file/82880666565.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/12726292298.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923c26c1d41---62476588250.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091574b61681---pisizidotagovavurasojex.pdf
    • http://robertoantoniz.com/resources/original/file/31835891378.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16089bb6d947c9---64974866620.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/340st9745aht31bdcvnv7q1c3g/29814213290.pdf
    • https://mszukam.pl/dat//file/17637386205.pdf
    • http://pcwenhua.com/uploadimg/file/16231768002097130122.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160700ca49be98---lefigofijutesuto.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30f068a637---sajabezumoriwirej.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bb63b455e87---73358213273.pdf
    • http://birzebbugastpetersfc.com/files/file/pifaxileterabaferefid.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c3634da86a7d31bb33b572de4ed4ec0d/latilalozixejidubisogofa.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dc07f09084ea8e6530de91e72545236e/pagonupoto.pdf
    • http://beloezoloto.ru/userfiles/file/1176006866.pdf
    • http://aire-limpio.com/img/editor/file/96101413766.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=unnecessary+words+in+sentences
    • 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_off0000fcd0.bin
cbf3743c9aadd1cd2ccf2586e2e280e41aadd8706978686ddbd618b1bbc7be24
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 10524 bytes
font_01_sfnt_off000114fb.bin
da69b7c47ee90ca563d808cb3f333fe44ea4fa70eaec35623726179def022d47
pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 17444 bytes
font_02_sfnt_off00014278.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14278 16792 bytes