Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b6a0180f41baa1…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 13:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c7d63b1fb71cc03922524711820ea5b SHA-1: c68101d967eb6523bebfee3bf9e5856fab438c89 SHA-256: 36b6a0180f41baa10838d30186ab00c3b89f630f4a58fa394761a2e4009ca718
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, serving as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=edital+mp+rj+2016+pdf PDF link annotation
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/pozup.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f7abvn6gf7ci3hv0ltlfq7c9i1/5080635414.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210906081231.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/pujidaseka.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/venegosumalotexi.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/ginaferelagapu.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/jdl8v8pbdsskt1hucegl69e7pu/bofawogurupuvogoxi.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9399cd73c---52012377247.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210904131847.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/vamav.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/zevemixogewarofevatefuvex.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/94915994847.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130f648c72ea---84695569089.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/50548766052.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300887c459c---potitudaluvulevizanof.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/furogatapidokomopuzo.pdfIn PDF document text
    • http://paliukenas.lt/i/File/13547238393.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/zunemigutonidelofum.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/varepuzu.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/moxigudutifekonilitaridu.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/wojepebawujafegonuten.pdfIn PDF document text
    • http://runhouchem.com/upload/files/sagofobusalesud.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/5045596378.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/xowitujanezezowunexava.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613027a5c9496---vipufu.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_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 10708 bytes
SHA-256: 50fb31bbb41f6f21ed328700bb6f1f2f649076b3e210138c22ed1f2b53a7a9ff
font_02_sfnt_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 19180 bytes
SHA-256: fc951a37db0879d0c82555807480b4b8d9d30a4f36fba2b9b9d06a582e41592a

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