Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e235cb6e5894098…

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 04:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc082932d885059850d391e84d75dc2f SHA-1: da51ba68dac9bcb1030091bb6f6d62272626cb1a SHA-256: 1e235cb6e58940983c9f2126ccdd35fc05c1bdc4a067e2138d76ce132ca31e09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://bouwservicewinthagen.nl/userfiles/image/file/nizevesejaxozoxarileru.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16085109c782a1---11765077657.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/zagukudokitusofudem.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/13710916056.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/a4umu1dmrel61jvbk9q99884v4/pibejujepenuwovewafida.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf7e4d608a---57817312632.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609488157217c---naregove.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087979b2c94b---84431496461.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/24077490849.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/tozedewodadonotedaman.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/48687353630.pdfIn PDF document text
    • http://abpaluso.com/upload/file/68372590466.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/cb7b83e6d8a7cec2200ca1dee48508bf/vefetositusetisur.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/37165837492.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/lisonanikumezowuri.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/jajilabifobeberevabevuxe.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/soremetexofasizinabajiga.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/fidiwami.pdfIn PDF document text
    • http://24cvety.ru/upload/files/76756385839.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a0ba9bb074dd832df6894d7f76f6d866/14742119421.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/vawavitenigudipifilowu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160831f8553b58---jezujapugabumulokofa.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/92710876764.pdfIn PDF document text
    • https://anjingliar.com/contents/files/sumezifezafatudem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=football+fixtures+and+oddsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 10664 bytes
SHA-256: d1606e491b8ebd11d4f734797d4b1e569357a8b8619c1bbdbe5044d4f92b6cdf
font_01_sfnt_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 16888 bytes
SHA-256: 405120f6281e9001416874a9e80a47c09749ce99e281e56089bf0a33b4e6906e
font_02_sfnt_off00011aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000132b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B4 17756 bytes
SHA-256: 5b076728e9c8df2f1662133b59065120acb4f2bddee9a316992c28f6ffd59bad

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