Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63ad06354431e91…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 14:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26639f4c575c69937dc98d77b84f0c0b SHA-1: 9b684c159097575546f3cb696f62ae1223fb3914 SHA-256: a63ad06354431e913d745bbf281ad8f85a96b1dc56299bf548c2ca473e3285ed
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that likely lead to malicious content or further infection vectors. The presence of multiple compromised CMS upload links suggests an attempt to leverage legitimate-looking infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://oniceh.ru/uplcv?utm_term=the+lands+of+ice+and+fire+pdf PDF link annotation
    • http://nanouklid.cz/upload/file/pizegop.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c8768e074---30809395773.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/zawinadipemisojobinoxa.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609404cf8fd5f---gopox.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086a50c7bac7---83121194668.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/66013070027.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080600e267c9---81848608091.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/pifux.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/32784132304.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084721470e37---99323672208.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/nuworomab.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/22700628589.pdfIn PDF document text
    • https://mollis.rs//files/gedekoredirumoxevikaxon.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc9ca922d---21139914767.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/jivalujulegovuvofapugon.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5ec28aeae2176635709f9b7c34f4e46/watijanetepi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec57f0b96---39031997196.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086929b21969---jaxij.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c0ab407dd917722d1b1d6b79e2be8d12/mojovazoxanazuzixomow.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/89521697424.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071af3c84941---kolesijoxulabifilovagusuz.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/777bcad089219e7a45ff97e02538ac99/dapozedusanut.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210828101527.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_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 10584 bytes
SHA-256: 2e1141961e808a2c79b757df1c2dead1b4b7b7bed44a8d71ed5c4ac4c42c8c52
font_02_sfnt_off0001144c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 19280 bytes
SHA-256: 399b54f2259e5a286264d9171166ccc3d19da5076ca30958f572cd463d1f8cff

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