Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3112f8b64928dc…

MALICIOUS

PDF

91.7 KB Created: 2021-08-06 19:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf11d9e995eae53e16817edd1ad9f472 SHA-1: 7b242335dfbd762b66c358af650bdae286d99398 SHA-256: 1c3112f8b64928dc90958c17720995d811508503b2eb38d3685733c7268e04a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent of distributing or hosting malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2722e00d0---jedusagobetaxabamotobelu.pdf In PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2626acf439---makaruzuwokolufa.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/71799432141.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/ranafogixekeraw.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081488fa4f39---97382161873.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829169cf56d---64164128460.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfbbaeb5e3---99120384671.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/93149026176.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/warovolar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffbea3b0b0---31498535118.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/fobuwasupevagu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3605a6e7---sewalenuropupulen.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a80e8fab099---93873859511.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/q1t1djngc47f50pu4gkg9rpfds/pilisuwimokubofitafupuzit.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/12169406284.pdfIn PDF document text
    • http://4bx.pl/public/file/kigivezafoxumozajekitadib.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/44067f38ffab99df64a733adb0b0f73a/2338662105.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfcb2a865c---22088869655.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bb9cc77ff7de7a791810a7565c3452a/wixawuzekesikavalux.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e1233386099a83c34b74895c463fd846/82699145051.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/zizikejagib.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/nebogixozevoturusaxagaj.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/muwamoreserobaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=times+table+practice+sheets+year+2PDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/zolokurumola.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_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 10752 bytes
SHA-256: e0c3cef743e9bb4f952106fdc071824f29099533c3f02e428f3c8c4b4421d06c
font_01_sfnt_off00011a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 17904 bytes
SHA-256: 32537f3b315fb86487cf6f4297a7488d55e6224abd08c23afb19df5d0fbb9e7b
font_02_sfnt_off000148b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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