Malicious PDF — malware analysis report

Static analysis result for SHA-256 86669cd33ea864a1…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 14:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c1e7142fa84176efbe83869dfe7cb80 SHA-1: 38bb388ce8c7851e5f7e160236489fad8938035a SHA-256: 86669cd33ea864a10501bb14e18b6f93bf8ecee60683ae809ecdce69e33a5ac1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The embedded URLs, such as 'https://catamma.ru/uplcv?utm_term=dragon+ball+season+1+episode+8', are likely used to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://catamma.ru/uplcv?utm_term=dragon+ball+season+1+episode+8 PDF link annotation
    • https://what.whatproperty.ng/ckfinder/userfiles/files/xafizegikifonujajam.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/27516876161.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/vagudabofikewugonewaluniw.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/82997613244.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d6c9ee40002644252af39546d3ec972e/dubawabofebuwesi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/72071907800.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jofexorup.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/95488946923.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af7b35dc23---21986659155.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/69079834827.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/xubikisoniwapegodigupe.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/14/file/20210914_163451_154.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210910203536017654ljo7nt.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/12285e63bfdf4020499037ac87d9edd1/ramakakilawew.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/96024171835.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/46210000975.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/59639831663.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/kobefibolujilegolagos.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/19b841d19cee9a5251177bfa51768a23/bixusudod.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-26/20210926112121197508.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16142588ef00ce---25289847532.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/97899737450.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_off0000af64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77B 10868 bytes
SHA-256: bb3962bf8e0cc13439e5ab9589ed8963a40a5d4af03e1816d7f78bee4b04a81c
font_02_sfnt_off0000e03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03E 16560 bytes
SHA-256: f71ecd7e339c78615afcdae0b2e642fca0ad3964b7e48759a042416974cd234f