Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9049524a7add56…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 04:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 49a64f14a0f05969379184beced26eaa SHA-1: 6dcdfb25df6e39712e557bc106566a3f322685cc SHA-256: 5e9049524a7add56c2712cc727a65a0fbc42a84b461481b5edfa92ca26c68db6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or content-luring scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://isagenixmakessense.com/ckfinder/userfiles/files/pegejizusugadexulitisuj.pdf In PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/pavumutorelafeditum.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/73043218984.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/wupivotufijid.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/xukejesawixo.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/26107960902.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/seweselu.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/gataxafeji.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/14932933512.pdfIn PDF document text
    • https://olterus.info/contents/files/nafuvobimelekot.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/sutekolebezotap.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133e30c47748---81048047095.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/74171430134.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/kolexugisizafofuma.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/9dpijj7ovt7qoj1s4c2or53rns/32369013484.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/zuduvetutivigasobuwanunem.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/pojupozawomekejotogago.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/figatumot.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/29d1f39fe47c7a11c6df58e4719a298a/fomajikizomujejawesabaja.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/sivekurotuva.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/46970255209.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/66181118537.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/67552227082.pdfIn PDF document text
    • https://bloggerpilot.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=free+serp+checkerPDF 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_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 9920 bytes
SHA-256: 8c1b7504f20f5ab9313d78d1f404014d7391816529a9e90535f077a50d6fa635
font_01_sfnt_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001030e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 18120 bytes
SHA-256: 7dc24e4d1e228fab723af0948677f5a5ec996aca2d1bb63605d5afe0b1d08313

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