Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef779e16bc9ac91b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 07:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ab42ed0eb172317484b74eafff61d2a SHA-1: ef9300e8f83719d034356a0338e9532f0054a699 SHA-256: ef779e16bc9ac91bcce939e08e4daaaf378c0c1224b439d0da45267d1a4094b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of PDF-specific malicious indicators and the nature of the URLs strongly indicate an intent to redirect users 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://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/frlqqifilsosolspaq54kfnfh4/22006053511.pdf In PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c20d52b94e7---dodidusitanu.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/govadananazupenaletoru.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/20622356038.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/138930c96ed002b5cd998f889632d7c0/7763638318.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/duxonajopuleliz.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/78635104.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/6413347144.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c102b9fb8705a4109f10167fdf643eed/67743243.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/82cfccd4b43ae326a7900a5c8fb5f36a/98492079827.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a98eacec3ac8d7693bc47cd17f6aec2e/37969532643.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c22bcb6001d43f47eb38c18c55b2e41c/26015360996.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9df51cfbbf---pefudinafatajo.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/61852093746.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/97653355990.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/vapukilipipis.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c140278df3---81634061418.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/68029542813.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/fukowef.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160921a38b6165---lazesotusupivinibube.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/zusegaxajaxuxonemorifi.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/77158869404.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779b7686bfd---42061651314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=myelogram+procedure+pdfPDF 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_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 10708 bytes
SHA-256: bb92f34d86402a875548c89394f89ea1869a708a4df20b47530398a558ccceeb
font_01_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 16136 bytes
SHA-256: 784eb6d1578e9f101f02d2583a1a449c1133b2073b89691078a85e69fb7ad49b
font_02_sfnt_off00011ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.