Malicious PDF — malware analysis report

Static analysis result for SHA-256 5090c1da00f2a397…

MALICIOUS

PDF

83.0 KB Created: 2021-09-24 04:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a9ffa0c6e38509b44c06ec97cd6cfa94 SHA-1: 08608c1aaa623dd29ac431853bb369fa0c5ef1bb SHA-256: 5090c1da00f2a3971e3f50ce609601540fb04b7fa501d78885f814f2417492d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL farm suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3df8a119---sawosukitizakigegaxu.pdf In PDF document text
    • http://ptichile.cl/userfiles/file/tijumunipuxedipijim.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/bameparirinobagavij.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135342c8cde1---72754893524.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210921135428.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/32188210548.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///51134845821.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/jabuxanuzanigu.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/ruwemagowisulewamaro.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/36774136399.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/nimozuvifeziwutif.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/53698194741.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/43679517659.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/41934320708.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lodopusonilefokewo.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210922151202.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210911/file/lotivotutoserukusaz.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/9qf5ree9dartrefhjlgkva99ut/57971623269.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1abd12cb9---wirikozewexe.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/lubatafuwumezolapib.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/63150080893.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/14793672752.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/14649544828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+find+sim+card+number+on+androidPDF 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_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 17204 bytes
SHA-256: 62894a666c78932bb0cfb5fdcbac9d7411c0ed1e9ead26af0d1098e6237e55b3
font_01_sfnt_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 10908 bytes
SHA-256: 407380a01f0cff76f4d113809d07e19e6c394418722d89ba42867319d1ecf0cb
font_02_sfnt_off00012618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1