Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d432ec55c98a6b…

MALICIOUS

PDF

71.9 KB Created: 2021-09-08 14:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6fd87070adcffef512f22c807625cc54 SHA-1: 0a8f8e659bcb9d2b6cf40b8a0116b81d38074d33 SHA-256: a0d432ec55c98a6b06eebe695bf4fd4b19549037dbf8d26b8d4ee7acace83cbd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://asesorgubernamental.com/images/file/labojotomugubeluvot.pdf In PDF document text
    • http://asztalosweb.hu/userfiles/file/lojini.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/zojenubunezulixen.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/betago.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/lonenofafeluju.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/92770529444.pdfIn PDF document text
    • http://hoachattn.com/image/files/soluzesuxozikoge.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/jofejoruxuka.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306b1aa1233---38943028129.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/90970787414.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/ximewomasemijuke.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc0012a5c---23909285234.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/47516390393.pdfIn PDF document text
    • https://codecs.ro/images/file/ramugejokuv.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/58012410426.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2b03eaaeb107a0401ddef71d35ce7168/jipul.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/sekikuxox.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136565aefab8---badesujezari.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136b644e7532---nedax.pdfIn PDF document text
    • http://igruppe.no/ckfinder/userfiles/files/nujidagebotekimilirinajob.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/87185527967.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/vusatipapikadanagudale.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/xenenaxuxulududomulem.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/23799260366.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/80096600179.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/66775496430.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161310de994798---wofolowat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=elementary+linear+algebra+6th+edition+solution+manual+pdfPDF 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_off0000b8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CD 14976 bytes
SHA-256: a7cb40583a35775565ab5b9201c33688a0309cfbcadf99fe0829dffd1d619db6
font_01_sfnt_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 11452 bytes
SHA-256: a90a2ccc861977b32bbc56706a13840695c07e8b2d3388a7a3bdf352f6e3cd41
font_02_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1