Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a788ab7c816887…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 06:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 092d181d2e95034b2414354395f49ea1 SHA-1: 28496a20a658b9ceb92a2ebf2137399bce508eda SHA-256: d8a788ab7c816887846d02d7167ace9373a59a2cd7eb43b14cde2cac3d851f7e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document is designed to trick users into providing a password, likely to decrypt a malicious payload. The presence of numerous unknown URLs suggests a phishing or credential harvesting attempt, potentially leading to the download of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 http://re-media.ru/foto/ck/files/rigidivibuxozaxuvitonok.pdf In PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144157f26669---xudafumafabopegagolidis.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/54895541215.pdfIn PDF document text
    • http://drironcat.com/images/file/29189459525.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/liriporuzipamuwuli.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/bafojadutifejatew.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/q8ik0hsiqkhj809glb85u46re7/36286553378.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/74547260133.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/tevuzenapubifut.pdfIn PDF document text
    • https://pokereshop.cz/data/file/38213094144.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/93311048277.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/zuzudezofixate.pdfIn PDF document text
    • http://nova-auto.com/upload/dupapukijewopuzelarujenub.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109240000049138.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/8065564868.pdfIn PDF document text
    • http://anitacalderon.com/ckfinder/userfiles/files/39266970676.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/17012146972.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/wojifodalo.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/dipisalopatar.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401a8944661---riwesorojogu.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/kinisisiwomijuwe.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/19154582546.pdfIn PDF document text
    • http://finchamauto.com/pics/17289370694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=break+pdf+passwordPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140102d6352e---20443423007.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_off0000b015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82C 10380 bytes
SHA-256: 0e16c051d352e1c9265fe30f4936f9d35602c2cf8c13119babe3e3c639017afd
font_02_sfnt_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 14988 bytes
SHA-256: 1f111b8dc9d345ab0069e96dae76d0a66af23837f4bfc2df98d5d60e852c9473

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