Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6f10e222235530…

MALICIOUS

PDF

99.0 KB Created: 2021-09-02 09:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b93599a84e59efacee5b260e1ef5b03 SHA-1: 4bf224442f5a0ca67a094aace8399e0574c8b9ed SHA-256: bf6f10e2222355308257bbe3e1abb363cd0fa98dfe2614698b19bcc758b9d4dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://wastran.ru/uplcv?utm_term=millipede+in+my+house+plant PDF link annotation
    • http://hzbmsj.net/images/upload/File/92248126423.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/95087004524.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/22096408359.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/23824902808.pdfIn PDF document text
    • https://artbynela.com/uploads/file/93997331354.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/jegosakijuze.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f671990cfe68b49dc32dffca32f55602/93393353121.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/3716108664.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/regovuwasoja.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/mowige.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210825_B59E6C4AB7674F72.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1ae1dd34---zaledawirupomulukimokawe.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c0c823eb5---3596963153.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/ruxoreseridokijune.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732704bde29---nawavepeguzesedujep.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ddd8b87ab6d3f9682355522820a6ba42/21495719359.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/jolotag.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/44067839607.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160902a9c8ca9d---96361451411.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/35437544299.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a3de229f30ac8bd345103eb78170748d/60900737852.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74e8bee6c---zupoxedixavogurix.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9170a60b4---texalivinimo.pdfIn PDF document text
    • http://short-story.ru/upload/file/jizopafikagarerudegi.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_off00012002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12002 18148 bytes
SHA-256: 3ae0c508f42b3a458732e7dd96aec71d6ebb40183d3e464febead07f5bf617cd
font_01_sfnt_off00014eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166CE 10764 bytes
SHA-256: 720ec8a4d24310e4ff4ffc5c1698c078564b250f8f24ccf583b9728ca5dd3e84

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