Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f034fb99cda4697…

MALICIOUS

PDF

71.5 KB Created: 2021-09-07 15:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54b1326ed95670e19dd845a1ce16bf5f SHA-1: 3f656be9ae612a2b470e6c8dafb0d02b24381057 SHA-256: 3f034fb99cda4697fa008c5ce1ab1dfd1e5f88b48c6730cb391dfcb0e9c80353
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://spodne-pradlo-2bpoint.sk/UserFiles/File/86909434490.pdf In PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/b2b7a631a235ebba1740c31a08d65390/47357099206.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0d1700cd---xixumoziwil.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/xuwuxefunosa.pdfIn PDF document text
    • https://ebooksweb.net/files/file/zupiviraf.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/47863924447.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/zifofuvelajile.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5df078e31---8702901165.pdfIn PDF document text
    • https://soechi.id/userfiles/file/zekemodejigulazebezemo.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c889d81f95d---sunobipume.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/wazuwubavi.pdfIn PDF document text
    • http://medrea.ru/upload/files/zonusedutiko.pdfIn PDF document text
    • http://ymmicro.com/files/files/jewegene.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/worakoxogebibozokenawuga.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9efb4c9746---59279327487.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/26050355944.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4f87de52a---50596861950.pdfIn PDF document text
    • https://turbooto.vn/upload/files/bixofojapifofaxelozo.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/gaktvau17ja1kv01eo2m990kj5/kofaxevel.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/fujajitarexujijejir.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/gurij.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/91b8f94300b9b50bcf32b3ae871366b1/26243409767.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076af6f66091---78314277144.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210801045736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+reader+free+download+for+windows+10PDF 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_off0000b73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 10512 bytes
SHA-256: 190055856f8244f0957c9464ad6e9df1c01632f73441df31116179dc8487b834
font_02_sfnt_off0000e768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE768 16080 bytes
SHA-256: 8afff82de9bedf9e94fdc23efa818271862d9f14a55329413050da418efbdb9b

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