Malicious PDF — malware analysis report

Static analysis result for SHA-256 561cb1738007785a…

MALICIOUS

PDF

87.1 KB Created: 2021-07-08 00:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2f469064a4e135ba3fd0b013151e30c7 SHA-1: cffa76e1df1f5c8133b48c8a03df83a796ed34e8 SHA-256: 561cb1738007785aa9043169b567c0de7cd296abb7addce6aa36a5f0c9d98a1c
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination or leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afc09cbb97c---gumebajokaxumusitugo.pdf In PDF document text
    • https://fenixfalt.com/userfiles/file/vufiroxofigedumonorijil.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/1314afc971d447540f87be5d418a5ce2/banar.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9af7fe828a---goxibumom.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/11799802550.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/xusovezaseke.pdfIn PDF document text
    • https://aedwea.com/upload/foto/nejikilusugokuzomewubuk.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/o9q88gknnec9nlnig0kf0uhdea/pixopirigovozuwawuxute.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/32930357113.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210610235753353.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00ae2da17---50585607305.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/zopesaxidopiwidifuva.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/gikagu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9edbaca2f6---14424070224.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/18933119038.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/84198403235.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/15835142042.pdfIn PDF document text
    • https://baptistfriends.org/media/dedudubuzilarevusiz.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/61890645398.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d2eb56574490ea54fa52fb3a0986d31a/fojekimiputena.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1258922755bc335b1485ddbac9f144ca/39528768405.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/79875963221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=foreshadowing+in+othelloPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 10592 bytes
SHA-256: 6be5326af6f4b874465794862a3db36e7bff8238d4fbd96beb7e1d30ae2ce7ce
font_02_sfnt_off000123c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 16892 bytes
SHA-256: f7751e8580445d6b4caed17d056b459d84c148321467d6437e29a549fd8feb97

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