Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7eddc4d34051637…

MALICIOUS

PDF

73.0 KB Created: 2021-07-02 19:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4b6bdae3c683cba133192fc6b636bbcb SHA-1: dc3b286842c1646d80faaee850cff94588de0ca4 SHA-256: d7eddc4d3405163715f38bd4ab9f726f9f826a2bc3d80f02af6f58a386cd8187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the nature of the link farm indicate a likely initial access vector via spearphishing attachment, leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb5afdd927---lojilis.pdf In PDF document text
    • https://sharenkon.com/files/jojojijerujelevut.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/0nk25j9hnukbj7ba3g2crrmof2/zediwariwesitexekok.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608541306eb24---78392553056.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/be7782101c6dfdaf269ba892dff10cb7/53388997192.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160859b077dadd---jusizebolajaliloxiw.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/206776ae927d71c22efc710f1c4b25d5/20398036362.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/83dfe69244621464d782a791b350ccd9/68916956147.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb2d85dbb5---jafobemowekigoweris.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/2708212254e9a66bd793e1185be83321/gujagin.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/fekob.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c93e3ed159---1554432091.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6c827bbfeb345d7d99ba5d00b89c5961/14842383305.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160820f7a0d939---17547857923.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b4395aabce77ba6388e4a533e84af238/20562371992.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/79429410907.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cdc6c0aad---89047099371.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/es4p25lv856i1e02ebd5i86ksu/motidanuk.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/4d77023cddcae9e3be9e4eb325a9a581/jifurulanevejaw.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/f480b275ee0a2c6a0014a31fc4ca6609/bakureragimizunatazat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=basic+core+java+interview+questions+and+answers+for+freshers+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_off0000b9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C1 11252 bytes
SHA-256: 682f688f30792821ced9818499de9e1866a9e5f432f9385e835898354932c28d
font_01_sfnt_off0000d3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F6 15656 bytes
SHA-256: 93764da19697813d0db291b999b3de22b636b69d40880644c73d25c828533dd8
font_02_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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