Malicious PDF — malware analysis report

Static analysis result for SHA-256 9747aa937b20d442…

MALICIOUS

PDF

83.7 KB Created: 2021-08-21 09:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2912db7aa03eb166428d4426724ea469 SHA-1: 29e0b5103f7398e9388a949439e33a35be0204fd SHA-256: 9747aa937b20d442b8577302e5dbfb8a0d127a333f84c9dc5d69c853b1e4fbd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous URLs were extracted, many pointing to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, reinforcing the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://smidgel.ru/uplcv?utm_term=chopin+nocturne+no+20+in+c+sharp+minor+piano+sheet+pdf PDF link annotation
    • https://sklepbonus.eu/userfiles/file/lujoxajojifa.pdfIn PDF document text
    • https://inncredel.com/uploads/18177051906.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/zogasuxurarok.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076a456ab665---35803451650.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d219729ce2a---6740997757.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/22497789254.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/31960407478.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/pazisuzetovokoz.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/vutujup.pdfIn PDF document text
    • https://kopari.hu/files/file/funimitasipu.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/pufijopozisoteropate.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/f5d63f420bb348681ea30fd1e85aa03a/tekiram.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fde76e13bf77a6691ed3cc5624796360/60815612778.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607386706d1d3---pivubajabekefo.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/98cd33b62kvv2cojqc082tqv02/dakili.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/18577820bdd6ab1186fcb3b5ed048bd8/73414549673.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/73425201693.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/niwekevusune.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/pazobatowasoje.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/fovijejaposamijivope.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e0056637129---47918760242.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_off0000d1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A8 23600 bytes
SHA-256: bdd793dd2657f1f7a5e41c2fb3468f3c846d8d28299776af3a91beb961e222c0
font_01_sfnt_off00010d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12522 11212 bytes
SHA-256: 3e0cd451451fbbe1267b91b0c6d44f1e46a31eb44465e6f5ff9dc7578882ddb7

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