Malicious PDF — malware analysis report

Static analysis result for SHA-256 22574550d40572ab…

MALICIOUS

PDF

138.6 KB Created: 2021-06-30 06:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 18cdd0476251d09f3f93e7cfbced5418 SHA-1: 4255193a5b54a95f02d75912711c683d027d0a7c SHA-256: 22574550d40572ab6b95f2336772ab46d702d3ea6b3495e81ae0a6510ee1ee10
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://cructi.ru/uplcv?utm_term=arkham+knight+last+riddle PDF link annotation
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9977ee108---xaliwi.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/derifomigemokuvifekedi.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450ae00241---92416560168.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16086d69679ed0---45111840809.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/90431405910.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/62687775650.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949c0ee7cc9---80177665804.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5b3be244605cfac6b5b7eff8d63e630d/99980822609.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/9k9u0g1dmaklua9i1ct13626u0/siwejotin.pdfIn PDF document text
    • http://kleiberit.ru/files/file/sidenerufuzagegu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f89017886a5fe7c2f58b92e469f62288/gurejajewonugebok.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/76678932401.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaee8c6c91---49189851283.pdfIn PDF document text
    • http://51www.org/uploadfile/file/ff1fc146851ae38687d0b3480fb63af6.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/boxugezilivotipix.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/lufulixogut.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607049c564e70---6658273172.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/19324827449.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608867dcb23a5---kimeluzebikawefozanix.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/48103288770.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786264d8ab3---47678778705.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/1db66a72a11aeca82b852c94c06100ab/tisutasose.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/46db294c4a5b5d905d26fdfe10cb5bf8/lotivozavaxanunidebibete.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09b38b65e---fugopidemetewujuku.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/6796950371.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/77725991452.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

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_off0001be0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D625 10648 bytes
SHA-256: 21a4ef864d7f2c405853022555ae49dc0577514c50788ea73cee3b0e5f7a9a25
font_02_sfnt_off0001ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE21 17548 bytes
SHA-256: 1bf1e2e9498613b07e11848cb4ac8d2579a6d799609b59f3665182ee096a0a62

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