Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f99915e65d2ec04…

MALICIOUS

PDF

90.4 KB Created: 2021-06-26 00:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4c84c3e3aa6c902f35e209a1e0c6f88d SHA-1: 2b1e6c277c9f9bc9854aecf9bb152b7ccc87bf59 SHA-256: 9f99915e65d2ec041b13c68ee411ff3cc46db5e14c02eef31a9d2fa6fe6c3c94
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, potentially leading to a password-protected archive lure, which is a common technique to bypass gateway security. The embedded URLs and the nature of the heuristics point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://infrive.ru/uplcv?utm_term=external+combustion+engine+definition PDF link annotation
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb0fc7ccd4---56900647805.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607590c47596a---tuwapuxavemudumoxevi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2a6d924165be019b66f88ce46cbdf3cc/88275541416.pdfIn PDF document text
    • https://ivanamihic.com//files/powimesiweguzunonolax.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20cb8ad42e---pisupig.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/zukopegewovalexam.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/velowipoluxevo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff428f258b---tisuzidegi.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/zubisofagarukune.pdfIn PDF document text
    • http://fittbike.hu/files/file/81728761822.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/nm14pdcdhulhise740b1sj3jt6/zajilolagigofepa.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/16903524729.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/9557471850.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/17716242271.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/28619568685.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5831b2c1e4---tijebilofozusuboti.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072669fc8be1---lerofolowobavafi.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/33b6974e9138ff3e6c8779ae9e381350/babas.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/avuo54nfji0mndf0vulf5gjjo2/fepitarutu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/a46c1c4316881afbc918efd6b2d9f0da/sipenoxe.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb58506b35---memupelarisituzoz.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/kesuziperovused.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/56875610996.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_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 11144 bytes
SHA-256: fec207244f55f2d3283f718e37f4f347d5ef3c6eb70f5963ef19c6844f245200
font_02_sfnt_off00013031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13031 16984 bytes
SHA-256: 7bf5291a54273acdcc7bb9bca8daf3fc217217aa4ce1ef927a30a638ed195c34

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