Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a0525c707af28b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 23:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1df123b70953f46370091cf6044278fd SHA-1: 8a78df9160a3396cbdef9f7e0ce029f6bcc3406e SHA-256: 26a0525c707af28b097262c5e66447dca3630e33de5534cac6b348d1fe1d9191
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to multiple domains, including one hosted on a compromised WordPress site, suggesting an attempt to obscure the final destination or leverage trusted domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.aledrukujemy.pl/ckfinder/userfiles/files/nilapetemaxebezo.pdf In PDF document text
    • https://insolite.lu/img/userfiles/files/naletedifuluvap.pdfIn PDF document text
    • http://savemaxint.com/files/file/80503656937.pdfIn PDF document text
    • https://wsbtitan.com/images/file/73249535963.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/85797328365.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/vupekirokamopex.pdfIn PDF document text
    • http://alkanboya.com/files/file///satumokate.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/525417627.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/vekized.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/20046333381.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/vanifunutagomavosowewites.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9b1e59a0711ac12c04635b80ddd26058/vakawubogatufotele.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/newokuvosusej.pdfIn PDF document text
    • http://trevorhannant.com/70006486730.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161307748e5911---kokebew.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/5270473300.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/xububav.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140b96555cab---meludolimijuwadet.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402a048d884---9912607931.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/57090731211.pdfIn PDF document text
    • http://weingut-suppan.at/files/legazolewumat.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/22346318603.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/7762261087.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/78021643752.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/20109428025.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/27259008477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+delete+historyPDF 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_off0000e6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 10280 bytes
SHA-256: 565311beee66496ce048ad25eb6b0151e7b62f585998b0a82dbe7cdf38889e83
font_01_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 17080 bytes
SHA-256: 488be02131b8185112ff701c65efb8e298dd2369354b2af55d0a6424a7cd3268

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