Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db0be38fe70bbf3…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 13:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a77635c145c817e7fbd13557167b0b12 SHA-1: ee492786c52b86b20b35c983b98abeb9708765e6 SHA-256: 8db0be38fe70bbf3c2af022c0ecc6f30eef94fd48e4d6bcd7d39cd86ff123881
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload storage and disposable hosting domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

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 http://secureyun.cn/uploadfile/file///2021091122035357.pdf In PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/72051874286.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613568c35e36f---13538175982.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/16087539922.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f9dfeea4b---23907566742.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/dadaturunovuwibijesugim.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/nivurolewetugugulirazuju.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/misanonapejize.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/23205460683.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1491ed1c---70606535002.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/77525458291.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/34417426239.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/43787104726.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/97111706039.pdfIn PDF document text
    • http://brenderup.ro/mm/file/pugasafu.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/xugikeponopoxafolelogiga.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/bcfcvsuar76pbfbcrhv8fb09cp/71947456974.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/mapofife.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631605575.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/lapovu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f258b12f37---ropejok.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/57189913803.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/tidujejujigomuwiza.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161420acf7b7c0---14018023246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=aquifer+tim+winton+summaryPDF 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_off0000b0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B6 10756 bytes
SHA-256: 511a81c0ee6785c9a08bf9d94499982daeb03ee856603ad29e6d50cdc7c4b5ba
font_01_sfnt_off0000c990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC990 14944 bytes
SHA-256: b62939f046e2d0886f16ecc0d1f5fc6ae1c276705409304da3746b92814511fc
font_02_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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