Malicious PDF — malware analysis report

Static analysis result for SHA-256 356a8455b41dbdab…

MALICIOUS

PDF

73.4 KB Created: 2021-06-19 04:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53049de512b29bf51913b8700d5e5302 SHA-1: 55e7fbf08ad0345f7ac0a19100bf8a9de4ae3538 SHA-256: 356a8455b41dbdab5a2b89a331d3daf529535656aad85524a84850d94d5997e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, likely for phishing or SEO manipulation purposes. The presence of embedded URLs and the PDF structure suggest an attempt to exploit users by redirecting them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/5644301eb1e32be57c1a65c0a09b3b1f/jewufelide.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/77dc67e90964d3d4ae1905ac6a07e30c/vataxugagi.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/92b5754b3a374e867363454d05cc544a/nonafoxaxizobaluzewo.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c079f234205---99754365649.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5e84a103e500f2f18a7e933b1db687ae/rigidijeno.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/u4ef0rdegn6ea7vamb75lg38l3/wupikawegine.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1f09c0459---24680953875.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b934bb774---83457633956.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4f290bde565fc361d6834cc6242b1e32/32081947117.pdf
    • https://fokusmedia.com/images/uploads/95165535757.pdf
    • https://workinhotel.com/upload/fckfile/zopodod.pdf
    • http://reicar.dk/userfiles/file/nakujikumuzomonasurute.pdf
    • http://alemotta.com/resources/original/file/mumepukokutumikuribojes.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/48vjp58nm291p57lqk9sokot84/bipeditojulab.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/57f52u8o4ckf1oeb58fcf5bgk1/46151806604.pdf
    • https://blokhol.com/upload/files/zureluveveravebewa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=peacock+feather+colour+pencil+drawing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df17.bin
58a9798d6b313b3392f645860b554753fd2e0940e4460d267071d1da5ce19405		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 5396 bytes
font_01_sfnt_off0000f186.bin
b85613b5ca0e39233153749c60d4257531dcb17e373385fb3128e59e1df88950		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 11716 bytes

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