Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9698cf1ebfacef…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 09:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a003158b4da083a61cd5ff89c0ab9c36 SHA-1: 446c71131754b81c0dcc74bc2b7d6653ef5fc2e5 SHA-256: dc9698cf1ebfacef0ac1b272afbde9af756c70afca91b4b25fc33f4a97f91859
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=samsung+android+driver PDF link annotation
    • https://gaadalagi.com/contents/files/bomaxetilogixusexuduzus.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210907181139.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/pobavog.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/60935278909.pdfIn PDF document text
    • https://spacio.hk/attachment/file/wixasuzakaputobado.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/lodan.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/gebotemutipep.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff3f94fb46---454925145.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/batadesovasonipujopexazu.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/65065450171.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/47516260982.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/79350015416.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/tepijupejagexuxexid.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/7979504872.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/23296556343.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ce19d6a565b8991e2cd81263a1d2dcf7/gesepuligeg.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/gexatotosipesi.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poxokilaromojawega.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/taket.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109200320564681.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614911c313da6---merilawajojomonobobefe.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/gofaxu.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/58560634043.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_off0000b45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 17100 bytes
SHA-256: aa909d5deeb2ccde1cc7f050b790b29886138da10b7a3a4a829c8ede332fbf8c
font_02_sfnt_off0000f85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 10688 bytes
SHA-256: fe57540e4290c6d8ca9f1c650f77006c66aeabcc4f0081fada77b584dd166a78

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