Malicious PDF — malware analysis report

Static analysis result for SHA-256 de92650093fa6a97…

MALICIOUS

PDF

68.5 KB Created: 2021-09-24 11:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb191eb6881cbd88e45431187a56d6ee SHA-1: 0106049b47fbbb3a7ac69474eaa55de55a1dbcb0 SHA-256: de92650093fa6a97e70315d0bd2d9e1a5853c053bb5dfb0f6e00baaac90c8327
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://jfe.hk/userfiles/94848682468.pdf In PDF document text
    • http://teresachild.com/upload/files/tezaxexogovapedoso.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/juvajutada.pdfIn PDF document text
    • https://jin-ji.com/upload/files/dijezefiva.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/52792672958.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/d9tmqu9ik0altefp0q3nm97cnm/tonuromali.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bk554t3kkeopmm3gdpqtm257g5/kixujuwozeronepidosokoru.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613219f5180c4---nabutamipufarotopijepedes.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109162030456415.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/34198498983.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/gemomuj.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/44c4ed8dba820e57f908ab5e0828c6a3/44041642518.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/jixotumapaxikineduputu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161402361720b7---fikomojomawozurutibivadas.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d66c81f36b---56346788293.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161429a7e2707a---38071246843.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/56582310524.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210901_AA33148F1679466F.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/nekuti.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/80736620225.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/191253197.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b8c420c05---baxijuwumibibez.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/tegamifagibot.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d69441a014---38140138363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=live+nettv+v4+7+app+downloadPDF 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_off0000b024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC836 14972 bytes
SHA-256: ea8678d1e6c4099e2e5f16bbfcb64cc2cbeb30db79ade77b610c3debe2436fdd
font_02_sfnt_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 10356 bytes
SHA-256: 7d431d7185ccac5253e815ea2f6732eb1ae04dd88464b026ded3abf1420cc6b7