Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fcff7a726d60de…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 00:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf9b17b82184d1cb8c66207bc003410b SHA-1: 6fdb9b1f35b70c036a56d36edc0d69a4bdd7a8cf SHA-256: 78fcff7a726d60def576f02d4db05b922e1af5e8ac51cbcff5315a2cb9d111c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and links to potentially compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=hodgdon+reloading+data+pdf PDF link annotation
    • http://nacyc.jp/Upload/file/ninedogezokiziwonusar.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21c7407c9---nudogojeluwebuzorod.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/lerekozugabevo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108d967d5f29---rabajijuzilurakiler.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/35206197402.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e1212e2ff---zeverovalijiwemoki.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/xomidawavodiseruseso.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/70352969442.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/50728414035.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/90vni6his5tubgcmu2ukop84pu/rewuxiroburofigabal.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8c3c2b3f55e7a4ee20ef7692b8b712fb/wuxoxotudawukuxuvezamizaw.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/basowufotidemokewolo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/703beabebae48c1ab70e427ae6f6c6d1/35406316425.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f82423ab0---58442538757.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081323136e8d---36688953441.pdfIn PDF document text
    • http://santeh.md/img/files/25063884741.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/09qadj803ep2qsaeq3bp6mlnaq/9117465951.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/xudozijifozigu.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/parunogujibirubij.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/11884067249.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/45677147525.pdfIn PDF document text
    • 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_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 10496 bytes
SHA-256: 223633c66ecccabb2f24d2cbeb887fe86c5b810a752623eab690559b7549dcdf
font_01_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 18136 bytes
SHA-256: fdf0bd39ca42ed765d173d752bbd02cb152aae060880f60536b8ed57fa08386d

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