Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da6c75ba982fe45…

MALICIOUS

PDF

89.5 KB Created: 2021-07-02 13:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7196be75eae82f617c7150e11df93d9 SHA-1: 350117786daf83d5aef86d42a1379229c740d70f SHA-256: 1da6c75ba982fe45c252c232d22fbbca270557884831c8400458937ce93bfeff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress uploads or disposable domains. The embedded URLs suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607634f66d179---50141868126.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/95b9edb35e75036c6222f84579a1c734/vezutukemokapemevad.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/simokusazowa.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c1227cdae3b---runopezas.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608de0898b741---tokewifiguzizimenabama.pdf
    • http://jinanxintiandi.com/userfiles/files/vudisipilowizur.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e79458d1fdb9ae6e311ca10af72920ad/40573200187.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc072b22a7---deputetatatomag.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b195fbd99e---86254088728.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/rd8ad70gncoqi479fsj5c3vshs/kovuxegidiwu.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608621f92279d---fakixijerave.pdf
    • https://majorsagilekvaros.hu/uploads/file/wezevifonizugozobedaku.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f849f1520---50049456713.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099d60883add---84006948277.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ce24ea02---nenuv.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/l6ao7rg7p099499o62tghb7mv0/73470400477.pdf
    • http://agnieszkapawlik.com/userfiles/file/tijapewere.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/1916ndfr8n6n6kqm01j6qcfc1m/61857736026.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebd2977bdb---wexupovamewuwofekojoz.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077338bed243---xiposonopunizuvonesut.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/1ca014ebc4a0babd414e47991833f0ee/36264409261.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0beebd3649---912896884.pdf
    • https://alate.org/admin/fckeditor/editorfile/zivipi.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1a47009e---83933360556.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5ab57053a---24090513862.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=i+like+to+know+what+makes+you+cry+lyrics
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb10.bin
ace1dce2f7b8ffdd19d9a994fda5ba2d1f7f2466f1a44a61f7aaf7c76ebc415e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 17064 bytes
font_01_sfnt_off00012771.bin
8f4b4334f33efff50f0e00b2e1d1de127721ed0046a6e49d6689a89586f8ed96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12771 10836 bytes
font_02_sfnt_off00014056.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14056 16792 bytes

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