Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc30520d31632de7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 13:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cdda82e93ee415a0c7b9dc8180541f84 SHA-1: 9e9a4a5c104745d9c7e4bc11a946de170d2b4ceb SHA-256: cc30520d31632de7bd78b6fb1f5d930b40e6777762891279055acedb4acfda5f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple compromised WordPress sites, likely to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs are designed to lure users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/31b112641e7d9a39aba42cdc4deb4afe/78045174355.pdf In PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/mojavovumorotifizebatebok.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/dcb291b691e0d95b0215bbd119278972/24198727861.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/939abec8f7543aab09f10fa4c1eb7e9e/10219408115.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/1730817244.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/61978603721.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/gudokaboroguxo.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b7956298a7b134c773867e08bc61b7a9/robiraga.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/talexitegenabavo.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/rf3qic2bu78gpb2i0nljdrkdt4/61046155535.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a48c056a---popazu.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/90935647710.pdfIn PDF document text
    • https://migger.dk/userimages/file/gabunezofotuj.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f299ab44---ponevozutobomi.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/molurefapilup.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607416148f975---34269933443.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/57648801073.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/92145301505.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb44aa666d---pasirumugi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/85046328701.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/pavilarujat.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/fasozuwosujivizupekalume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=freud+dora+pdfPDF link annotation
    • https://lapdonline.org/file/xorurijofe.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_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 17776 bytes
SHA-256: e14bdf5dffcdd8195ef0ac41e5979327a7e4e50429d5fb533b1471fbf2bf3603
font_02_sfnt_off00011d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1A 10060 bytes
SHA-256: 1c6a48fc445f02e507a7b614fe7ac8f12194a3a34ad45ed2865bbc4be65fda79

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