Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43c0b034f4092de…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 11:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a73cad26f67df0390ad4f18894f51dc0 SHA-1: 60a62d3729a7bc3bf930edc2f483357b1b97dae6 SHA-256: d43c0b034f4092de08a71a0d1940bb417070f83443e108562fde99d369f0a33e
164 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. Embedded JavaScript was also detected, which could be used to further obfuscate the malicious intent or initiate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/dihkrr4vh4a5fmjjmap87mmo3u/92624282156.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887a1914caa---diwemibowi.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/88343912318.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084630f6d224---jekijoxumelal.pdfIn PDF document text
    • http://tipiland.net/upload/file/21322694953.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa135c14b0---59583000583.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e7ad03cdf---daxakizejixexim.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/71193308684.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608efe3eaa044---64577091160.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/503d3f0282ff1b8d7d5310e09a780720/fafukerusisodej.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/56403910965.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/vavupobomokoto.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/53751675223.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12cdb776a1---kaguwubed.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/liwoxegakitotojunojopaj.pdfIn PDF document text
    • http://bluenanum.com/ckupload/files/juraduviwakuzevudosila.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0grv1bf7ppd1bmoahbvh590i7f/43621021848.pdfIn PDF document text
    • http://prosquash.by/data/vogudezu.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210723_6363F221760D62F0.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070f84ee133f---37486989850.pdfIn PDF document text
    • https://ebooksweb.net/files/file/46176367102.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/250bb71b0ae52f0b45f2acf587e78f60/42256043455.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/39345357136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+a+wrist+strainPDF link annotation
    • https://medlineplus.gov/sprainsandstrains.htmlIn 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_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 9984 bytes
SHA-256: 1e004d1c3157271f22f6888855932a08db21e5c41520aa94bd3c9e615b189c99
font_02_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 16880 bytes
SHA-256: 07768848b321fa622aaf7384da93e7cd53f87706fb853157dc4f5a3c29b41a73

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