Malicious PDF — malware analysis report

Static analysis result for SHA-256 43211daad611e998…

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 12:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d11e86dc4cb8bbc3ac0c0810f2f701af SHA-1: 268aeb4c19faf97d681aa0d2fc58d18fdd93cca2 SHA-256: 43211daad611e9985ad045b2ea7ad1cf88e90cf86dfa1c5935bcdbd7c8fbcb8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics indicate the document functions as a link farm, directing users to various compromised or disposable hosting sites. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=pain+in+pelvic+area+after+c+section', suggest a phishing or content-luring scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=pain+in+pelvic+area+after+c+section PDF link annotation
    • http://studioingegneramato.com/userfiles/files/49762107098.pdfIn PDF document text
    • http://altinellerinsaat.net/UserFiles/file/99869526217.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/28678959171.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/71811007178.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a31eb8a9ca86463bb6904cd175bd7f30/14843078335.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/53895700610.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/92353987676.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8896945562---57420606424.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/72206110301.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/vozitimeke.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/dirijokux.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/eeoffpce7r3pr8m4ln6tokttr2/nenipumunore.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/96200953886.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/36919244517.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/delelilomajugedomarori.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc996f6a71b---64482808801.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4229e2b28b---potatowefewiraxatikejuna.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/jezinolufoxovideleje.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/15202712526.pdfIn PDF document text
    • https://morabia.fi/images/file/golenadaki.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096539403f05---zofusujurewa.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d57d52a7d32---kojifijiwaxowozabodosejep.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746751172b3---dafebadakenane.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/dawugajasuveze.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/96319353490.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612966104ac0f---54979737611.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_off0000ce29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 10540 bytes
SHA-256: d2f89e0978737881af9941f9e9dc25dad8ac3710888da05e91eb23ce9191e758
font_02_sfnt_off0000fe6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6D 17380 bytes
SHA-256: 45db547cbdd6cadd6a357b40212ce307fbe0648e59ac632ac2264f41cedf22a8

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