Malicious PDF — malware analysis report

Static analysis result for SHA-256 470af81739ed40a9…

MALICIOUS

PDF

87.8 KB Created: 2021-07-26 04:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78488b354cfd8cd2e11a9919a393ccbd SHA-1: 692f076b719aec3fff48ae18cb3be1564a647eea SHA-256: 470af81739ed40a917838a3720d43a6a753029a2b255d6d384d7a00eab3b59ff
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable domains. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/96196617095.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfe0d0ee04---88334953412.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/383f80d1c675ddff89240b2ecbf6d37e/52386787741.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/47583437716.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/wizinekapifetiruxitimej.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/afd32296df565c1e83be7635c44cb0c1/jurug.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c954d7ed234---totanifodomorerasobunoza.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/69175199889.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/ff0b2d6fbf0b4645293dc233edee0969/lelozanubujomi.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/zimazegujavupezilaziwalek.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/3176785966.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/54740429823.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/18399676128.pdfIn PDF document text
    • http://rinsacars.com/files/others/54735323801.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e8064b38ad0a77caaeaa32302a13a3c0/27552501650.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/76043207199.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5956a8c40d---36888397264.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/wananobegimorijak.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ccf3cf67b1a---65471393993.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/pawapopivivoxakisaxi.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/negabugaxevajetirikatus.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/24560776042.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/58990020673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=video+bacaan+al+quran+30+juzPDF 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_off0000d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 10936 bytes
SHA-256: 91687ac7e55171dd5a0200f1f7c53551dc21f3e4880c39bbfaff5a9f610c386f
font_02_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 16888 bytes
SHA-256: 2f69de7663ff72f789735362745ebd1d3a6f0a1fd924fbb7aa9a20ce0b363efc
font_03_sfnt_off0001330d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330D 17968 bytes
SHA-256: 2fc0d0c68470c561905e2a51897674cb3d000fef3e8f37b6a79b14db041f6c11

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