Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b5c1d35f73d327…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 05:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75d6904d25c859718bf49f52207f029e SHA-1: 1639a1054475eb9d088cfd5bf8f15e494ddf2795 SHA-256: 12b5c1d35f73d3270582ae26ff7b3cc225ff6019c176c2d2fd6da6919d94264a
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across many domains. The ML_NYX_PDF_MALICIOUS score of 0.991746 strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://olgapolyakova.de/files/files/4710028786.pdf In PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/vexasikarubumopif.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614200f002258---bajizilefunilemitut.pdfIn PDF document text
    • http://afro-safari.com/upload/files/6793723386.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/50165691514.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/joganulerizedev.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210911_5449CD32985E3890.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/rijanu.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/87361674252.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/97760507537.pdfIn PDF document text
    • https://cicimanis.com/contents/files/turevegotopuxupivid.pdfIn PDF document text
    • http://erimti.com/userfiles/file/35617955627.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/wumetasonob.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/kigikobixoluzes.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/42859260470.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/29277075110.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210909_AA2E9C61317D362D.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/4c6614a0a1fc035b762df840d90251a1/mobozirarowavu.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/861511b32ed4e40d247134a22585bf85/54214151622.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/14973653523.pdfIn PDF document text
    • https://petek.biz/resimler/files/boxogexajanapaf.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/koriligajomi.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/73925525609.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a13f2f82---pidefumipuva.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/73476659318.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/10662474572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+android+phonePDF link annotation
    • 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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 17752 bytes
SHA-256: 78a363310eed3f105ceabc8270541d61b19390cfe5125c8b6e217de1f4d321e8
font_01_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 10496 bytes
SHA-256: b8d49228e297545c0e7d495d4a5794781bd6e108ef9610b0b3eeebe9df429b16

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