Malicious PDF — malware analysis report

Static analysis result for SHA-256 6381cb7cd3140ca4…

MALICIOUS

PDF

81.1 KB Created: 2021-06-30 06:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 42460ac5cfa74ac103b863ea3d3f1c0a SHA-1: 9861000a61fc638f075eb1975fab490a4874e3de SHA-256: 6381cb7cd3140ca4b94d39d2ac8b1af45298aad4ec0ed3cf56a2b9dc13c33bfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf9007a093---duzexufadoxiwusegi.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6083c0e89c---kivoxuvudazijiwejat.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/2esharbr9o5c0pk86kfkn3eaiv/14187991338.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebd5764370---nivipin.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/17854e1fdba0be5f2cddcb59b17c2a7b/fonarewefeziperukaso.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7e16e1eb---14195516553.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/vea5sdlfanrnrddm77rbsivgeh/64857603590.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/15287641870.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/ratezeparaxegazizuragepo.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/92ar8moj93hbfeofbn5ci98a0a/55693390085.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3581351151f9d6a0612c5d384bc1b33c/samazadumusokajiriv.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa40a9e97---tamodamoju.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/pp44h3l1grp1ttddln1qj58rks/89684695080.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/69224097474.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///fuvofujosanuji.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/79726509159.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/53b89c6ceaf4ab02f9518c980b4092d0/32459970588.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/tped3rq44kmkhn73a3elnpq0s4/bididirigidewapaperebipok.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45b9fe9fe4---20641083801.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf140a32f3---34002980225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=jimmy+fallon+almost+famousPDF 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_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 10348 bytes
SHA-256: 565616690eb60e731275eb6b5cd7ade3f40a0333f8dccc60da2527ac3ec7e41b
font_02_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 17180 bytes
SHA-256: a4af112e9fcb1a836a8e19e1e0fd975c25e667ae53ba267f73bb0391b707d3da

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