Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00c5404282ee9ae…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 07:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6e371fa7c8a9f4a4c345ce435f5f1a44 SHA-1: f823cce4c25d5d9494c2f06fcadbaff4595681fd SHA-256: c00c5404282ee9ae1382732ae6392160a171066460182bb67006eac434d95bc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, forming a link farm. The primary purpose appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://fotosvatba.net/userfiles/file/mijufezoda.pdf In PDF document text
    • http://akinmedical.com/uploads/file/busemekinorenujubob.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/zowapuwivi.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/rukive.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/4e90d13904f979a6b84af9b3a0bc46e5/49320265052.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/55465030674.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fb34c6e50---fewefebateg.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/86551506615.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/66375993758.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaeefafe11---41456350516.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/59840207471.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/377cc0c934d3c7acf0b3bbf4efa6e037/38832649464.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4e1315a8f9b22586d1a0db7559229ad2/40179945698.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/92fd0b382f1efa2cbf6993abefd06be0/96526620547.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098498273b03---fumavepivofe.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/zokerupubozeworitagakoro.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1a578d544---potuzused.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab33a6268d3---wewijumowusajisaxap.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70dd0b34e---dinofekazilatefofaj.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/c20d9c62656d0699392008a3fd893736/wijavak.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/bikovibamazilonufuto.pdfIn PDF document text
    • http://01host.ru/userfiles/files/wefigogomujito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tennyson+poems+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_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 17864 bytes
SHA-256: b5567a39df3724a9a5b965c9087c2d85138f4e61c391e248917926fc2b6498e8
font_02_sfnt_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 10240 bytes
SHA-256: 651e9567ddc29cc84862d62c89905f80d3646c5040f9c7eaebf8b53579d9d2be

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