Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e3b83cb10dbc70…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 04:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89cb5950c71c5c657ad360fdc6d024c6 SHA-1: 5394257637f6d6ac97cccadb6bc5d512d54614a2 SHA-256: d9e3b83cb10dbc7024ef5e24637a23e714e90cca12e2f2673e04e06f06173ade
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely serve as redirects to phishing pages or malware download sites, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=passiveness+meaning+in+english PDF link annotation
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/7c82abfc8ecbbdc1a314dbafcb578cd8/tukafezivovarowup.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d737b1c53e70d74979d9f87581a7a0c4/93997031018.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/acaa43dd56634f187cad5bc64ce0a2ad/foxagomoza.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/tajeru.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077738f54b97---xiwalurezupexaripenuza.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/56247260854.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4dfa8034d88bfbf8801d495c10eb50d7/83192347836.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/nijavul.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/53t9i8jdpap32hfg36um9dqn2o/raxatanik.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/6366252.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/526cd9bb15cbc6f12dba3daab825c962/98119471533.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b34e6ac18106e34c270a5da7fa3bcb47/lezusirumow.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/161091a06da41108e0bc303e971d2f34/46390757830.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/wegefa.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/9nlrjg0fdc952tr0msb1epvdh1/11201071985.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/72c5934366d511c2adcf9cdab4d6ed22/daziduje.pdfIn PDF document text
    • https://semut73.com/contents//files/63585787836.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/15884415476.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16106f9fb74101---kubogujelitidukubedisus.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0de8b6c2b4---209798353.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/fa2fdf9f923b9eb2d3ff72ebf9291f75/28522113711.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/2c4ea1c11927ef06f88527609af68647/kurafopapisutafajugima.pdfIn PDF document text
    • https://theipbuzz.com/images/file/26714667084.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_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 10304 bytes
SHA-256: fa6616c22b090c0ca0f3f609ffb09624a653b58c4d1afa267037043c86de679f
font_02_sfnt_off00010b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 19856 bytes
SHA-256: 5d64b9aedf32bb9d5e0f75dd2e1cc29800a4ce6adcb7de86e03a7ffeeeacf7fb

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