Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bddcb0201d20fe…

MALICIOUS

PDF

74.1 KB Created: 2021-09-08 13:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b9383d9ac22e488aa640a69af1c6090 SHA-1: c173a0dad44c22c6c53700c248bf8ca8e39d5159 SHA-256: b6bddcb0201d20fe536b4f87681bf2bff7201304a2d8f8e86350ffd53eb22158
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to multiple websites, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to potentially malicious or phishing content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://scavilecis.it/userfiles/file/19631997918.pdf In PDF document text
    • http://jamalcar.com/userfiles/file/jodoxage.pdfIn PDF document text
    • http://turnyras.lt/Files/file/tevagukanolatuvedeforuwi.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/21054163177.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/31634857481.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b05a2013---65776126168.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161362672d4d5f---7865926176.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/59542286877.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/sexutabiwonozujozu.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/8943082016.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/13713809353.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/jagofegomasuwe.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/83127750227.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/93093680821.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/93958685072.pdfIn PDF document text
    • http://meditopthailand.com/file/55070977102.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a55af33f---73257512632.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/61829364634.pdfIn PDF document text
    • http://evola.it/userfiles/files/76542674981.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/48256913250.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/55335220178.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a2a05f8b---rigolazibaluxeduvibaroru.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/546207649.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210907_094545_123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+story+of+ferdinand+book+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_off0000bd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6A 10860 bytes
SHA-256: 466fe0654fd67c9e414c96c6f7372e9999895fa95652bc9c7d0c135e3acd912c
font_01_sfnt_off0000d643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 17096 bytes
SHA-256: 2af24d16cb25d29a249aed817a62fe5d89ffa0d33b9e0c444b3afb7b04414b63
font_02_sfnt_off000102dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1