Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fe854db05d1c05…

MALICIOUS

PDF

85.3 KB Created: 2021-07-18 11:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ae36bb0f857f5b99bbc51096c8a806ba SHA-1: abe6a9b39a6259b8efd9ecf5c4d39b1534ebb407 SHA-256: d4fe854db05d1c05d5eb2f60914fbe2b1ae4ecd73a670e0ba6d0d99eb5b4d1e5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608498655806d---20725373134.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608553db99981---39398374388.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/2260037041.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbac84bb4e---nawepopidutirusetazomafom.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/13037638898.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/33591961907.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/gapepajoxesamofagite.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f5ca5ee30---pafugadegazomisawupusamos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8f534a82f---30902690638.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/18342846937.pdfIn PDF document text
    • http://sushi-belovo.ru/files/71837243948.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2263456db---88422370205.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074574da90b3---20033863678.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/pemufesesoduwoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744b341cdde---41046666003.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///tuxul.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/33661693279.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715fbba1f77---49114864394.pdfIn PDF document text
    • http://ned.ru/uploads/files/memofalufosiposerebovov.pdfIn PDF document text
    • https://advik.net/userfiles/file/87446469736.pdfIn PDF document text
    • https://digireg.cn/upload/34691528408.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608715db48ee4---bexezoriwijaz.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/94490271666.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe319bb4a---mazinoborijurimobivezir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=operational+amplifier+and+its+applicationsPDF 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_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10247 10804 bytes
SHA-256: 252597b9cdba0db1cc786f63f56afb029372ae787596bc38b48dafe6c96a6097
font_02_sfnt_off00011b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B28 16880 bytes
SHA-256: c5a41a486b10aa2c0343a980e64d8ad3eb4eb4091e070a23a67ca21538c37488

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