Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0274b3fc7ed02d5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 12:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 118b296cae17dd13599ee1275d4c4f08 SHA-1: 66c7a1bebc409ff9b41a52e28ae5651c8fab713a SHA-256: b0274b3fc7ed02d518a9672781c6d7618fb5f2fac47fa0d9e2bba1ddb5be1e71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and 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 malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crownprolaw.cn/userfiles/Proj_Name/files/tuwepo.pdf In PDF document text
    • http://varosom.hu/userfiles/files/kujezusixab.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/xilok.pdfIn PDF document text
    • https://matrixx.lu/images/wusoxebinewaxo.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/kakokexegotawijinazid.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/nopeniwami.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/gigeximazotawun.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/58107349183.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/tezusagotevexabukafegi.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/zalewese.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/17128897698.pdfIn PDF document text
    • https://tigapilar.com/upload/files/2292330043.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d22cb556c---muviluxotus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f5a3b4aaf---21387388993.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/padopotamavegar.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/zizufo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613983e4af18e---63876522721.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/38585320574.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/41808811879.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/73504664901.pdfIn PDF document text
    • https://phnews.ro/files/file/xodeburarigid.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161346cdcb4eec---97946059007.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/warutegobususirixopipova.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/40b2e3f23b500c2e15feea9be7b864a2/wemupopax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ludo+download+apk+modPDF link annotation
    • 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_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 17812 bytes
SHA-256: 4ae564064175f80fc477c51eddbe724dc82a0b2b2cf6fa1d619f857639be0278
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB8 10196 bytes
SHA-256: d8ec1c9a5e8614b3074314af3b5066f1d0e34a2340bcb0486eca3dedafababed

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