Malicious PDF — malware analysis report

Static analysis result for SHA-256 b686be6d8ddefca7…

MALICIOUS

PDF

73.7 KB Created: 2021-09-22 13:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6fc003b9f4a7b77d0faa6931c8719fc SHA-1: 5be03657e1711c2b0a35e4c99f7037d784849bc0 SHA-256: b686be6d8ddefca71181a8827b27848f5a6bf8e2789b63a0ecff7e7b23733dc4
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The presence of numerous unknown URLs, some hosted on what appear to be compromised WordPress sites, strongly suggests an intent to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://duongthuy.net/userfiles/file/gifezub.pdf In PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/gawugalulelituxego.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/29900559321.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210909220327_49zk6k.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/74288872866.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/41081816362.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d7dbd2847---72009974493.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/guwine.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210916155231.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/70032347418.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132711c4552b---50511555885.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/51198457398.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/33278472558.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613eed04af49f---65287836467.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/bovuginobibalele.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/saxepinojupuzezipapinape.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/56294900784.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/wilepaj.pdfIn PDF document text
    • http://kodemari.info/data/files/gudozor.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/vivexikenixijujeju.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b74a4b8ad---tavix.pdfIn PDF document text
    • http://kelvista.lt/images/files/23733429104.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a84d57a889---67884633809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+android+keystore+filePDF 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_off0000bda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA0 10640 bytes
SHA-256: 01ac1333de8d4c824953368d55c6ed612095a07b6db8db3660e2a638c01e84f5
font_01_sfnt_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 16512 bytes
SHA-256: 0288b0cf42afdd0cc7d4c66a3e93bfcd65fa850c155436443b49411975168c04
font_02_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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