Malicious PDF — malware analysis report

Static analysis result for SHA-256 955cf2b6734329ec…

MALICIOUS

PDF

94.6 KB Created: 2021-07-25 18:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ffacc08d27bd3ef529ec70b2316eff8 SHA-1: 81385980ea118e3faed81db53bbbae890fae9c22 SHA-256: 955cf2b6734329ec2575ce6635e6eef32afd44afc6c88cc24edb40929c404379
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91956a9042---3962581802.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/62511997035.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b709c06f85.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/kadidukobetorotefirar.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/aa74b172bb67ebdc4016187baa56974a/82343547156.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971507676cc---gurasosegosof.pdf
    • https://agrimal.pl/userfiles/file/fofutafojuwoz.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/jikuvag.pdf
    • http://hcvitamin.com/webroot/img/files/51082324967.pdf
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/giranitozoriw.pdf
    • http://donghozibistore.com/luutru/files/zarabojugetapuri.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/38v14s824ffv5rh7avddlqsptu/38605235838.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/23886912654.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba5a59775df46e97dd51929684dc7180/kepaluxojerexetokapob.pdf
    • https://rh-h1tapi-turbo.com/contents//files/fabuzeposumuresalu.pdf
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/pedesi.pdf
    • http://www.impactit.in/ckfinder/userfiles/files/nelizus.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608569caaa928---rujamogowijewanezivir.pdf
    • http://backupcenters.com/userfiles/file/bazofozifofedasupej.pdf
    • http://cloverpark1959.com/clients/51168/File/nujorulirixufalo.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854787164ad---94836836139.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821429ed80f---bolidumudamakaxi.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/woruxavesukadisobowexaw.pdf
    • https://angkoronetour.com/userfiles/file/97701885125.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/kufuxodokez.pdf
    • http://thevisionkharj.com/userfiles/files/sokekaxefiviru.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=temas+para+platicas+de+seguridad+de+5+minutos
    • 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_off00010a4c.bin
682948d9aa09cc4c980042caa46206f3cc01d7e367c012f43804bdda53ef1405
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 11052 bytes
font_01_sfnt_off000123da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123DA 16792 bytes
font_02_sfnt_off00013bec.bin
8caa5515032e5e42098f62dd8e66ed37bbb67508ecd46e5e7ee4e8eb2a029f16
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEC 17960 bytes