Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a53ee8f431e8f64…

MALICIOUS

PDF

69.5 KB Created: 2021-09-07 05:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5cdbc20a2e3221a9ae388655237d16d5 SHA-1: 8ea021f7f770aaa479a50723df6a5a1ab2ae4a5b SHA-256: 2a53ee8f431e8f64f45d35d7b079b4f769c6837f1c53089e949a07d74f27456c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating it is likely a phishing or trojan delivery mechanism. The document contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content or further downloads. The presence of external URIs and link farms on disposable or compromised hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6603

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=past+simple+and+continuous+exercises+with+answers+pdf PDF link annotation
    • http://jsushibrea.com/uploads/files/danozomaditarikiwovuf.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80775745a---34820380477.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9b6da4c14---30500639336.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/sumenekado.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/67827866939.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa854bc61af---gufili.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2c351e8fb9b8a05f36902a0ce71be1f5/baximo.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117043d1e251---sizuwataled.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/bijix.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/bugivivowutuda.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1986462672---menetupurerosuneroje.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/38c9b1e72c231dd7a3267c8f7d567c06/rafomawipo.pdfIn PDF document text
    • https://nada70.org/userfiles/file/22771930223.pdfIn PDF document text
    • https://foulardfotografando.it/file/98727887597.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9bb7bc78---47572800616.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/48f002f2d5ffebeabf86c6e1dff8e11a/77903135877.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/tokafajud.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b479557e2a9---38628739147.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/8443165821.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/1556e36cae9944d1a659207bd78c9a59/12283572769.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/k5853i7ss1kb0m479tjon95dvb/xofabefezanunigibezuw.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078a868e35d9---gumadexigeg.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/50794486937.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3acf1b0764dbb0fd9444cf060771fbdc/81958424658.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 16716 bytes
SHA-256: f5e9133792303d51abc4bf52b55f986111dad9309d9d67366ebbbcbc2df7af8b
font_01_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1