Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a54f5ae23c536ac…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 22:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03d57a735dc34ee0ab1d932769f3149c SHA-1: a5e7cf4d339addcfa23bf51fb12b13ed024ce70e SHA-256: 0a54f5ae23c536acfe3daaea3ccd023dcbc649705e96c4ee813883bd0d5b7e72
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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://philabc.ru/uplcv?utm_term=how+to+clear+phone%27s+cache PDF link annotation
    • https://immsac.pe/sgi_userfiles/userfiles/files/69201926189.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/3194138087.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/degokelopivekexoko.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/fofomoder.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131315dbd852---xejudabigubepudu.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/12367922200.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/wizegatogog.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ff52d6272836a182db054cb85d58a8fd/14351529283.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/61456738475.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/92459661257.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/tonunug.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/laxugoretowazadoxewibex.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/zibinaziwipa.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/71545124154.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/lazefonifofixura.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/31851362290.pdfIn PDF document text
    • https://andhimazhai.com/images/files/95461436703.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/lazutibudebe.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131692fc8251---rofetewubefupu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/babce0eef53241be260c56e1860ac24b/26718693531.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/306574ebf301e986168dc5b2c91f6315/muzufumewuvoduwovitiw.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_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 10492 bytes
SHA-256: 7e2ee7d768026b6fc6cfea71d83d29584e8c5f6971ee8277ae9156f8594d6172
font_01_sfnt_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 17648 bytes
SHA-256: c7e314d1360df8b77e42ab0de840b7ce20dd932bc8c6bff8d7aa2c637ebc9f25