Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b3a7016812f8bb…

MALICIOUS

PDF

68.2 KB Created: 2021-09-17 09:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0db815c232ae8870d38f7943355bd374 SHA-1: ed9d3a8cb50cfe92717d5ce5d9ed77ec95821475 SHA-256: d5b3a7016812f8bbc46884b769d18d36ee9174f988facdf24ef16bfeed127132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=use+android+apps+on+iphone PDF link annotation
    • http://jinyudachem.com/upload/files/nakuxutoxemaverutubaga.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/nokijakezexumebavo.pdfIn PDF document text
    • http://koddous.com/userfiles/file/ritolam.pdfIn PDF document text
    • http://alcantara.cz/data/file/29098882416.pdfIn PDF document text
    • http://kaies.cn/upfiles/210910130204634467vaacpy.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/66907126485.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e69b026a1---6967323631.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/22249794739.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/matemaludosusenu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131973f0c7e6---91444280438.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/wamepefunuvegozamate.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/nexotoboxevisa.pdfIn PDF document text
    • http://djpress.pl/Image/files/zizilexotukekutemisiron.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/66013966920.pdfIn PDF document text
    • https://migger.dk/userimages/file/lejizelirozozukade.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/pedalazovana.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/10229980188.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/dedavukumopewemigede.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0c1aesvg49sk2h28rdpb3pkdi3/pigaduguwemamizuge.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/loguxewewape.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/24149154079.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/winefajalikemuxewabap.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398def4bff4---35538657949.pdfIn PDF document text
    • http://etspak.com/survey/userfiles/files/49928048008.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_off0000af6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6F 10352 bytes
SHA-256: dc032b3e45cd67234c96ba89fa0e0e24ce841c84c842b009580118289b9de726
font_01_sfnt_off0000c6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 14576 bytes
SHA-256: 0422d567a32c3c3c91db54451ca6953e61012b1493ca5d4651620bb6045feda9

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