Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93871f5888fd167…

MALICIOUS

PDF

99.4 KB Created: 2021-07-19 05:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 776b84a9fcf15372b4a65df8db14d26e SHA-1: 01fe97f5308914005b57d57c9062695866e7cb5c SHA-256: e93871f5888fd1674f0dbe3de8f512d707cf514cd341f7aacebdd7efc86cdb90
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://animaliadielisa.com/file/nonogarafixeb.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hnad5e0omrsnq099pfks8k25k7/32810530421.pdfIn PDF document text
    • https://werbemittelag.chupload/file/26769152752.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160701196ad0f9---49907374387.pdfIn PDF document text
    • http://falerisztika.hu/tmp/60015866999.pdfIn PDF document text
    • https://wrd13.com/force/file/58122308543.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/79653154816.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090de963153d---jelefuze.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d008019bfa0---39595938336.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609be04dcd673---lalujetowivowimoboji.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/dd2cbf2fd665411d196dc90d61fe858b/38170573119.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/52rpopik3k43kcomnshlupf918/30257041973.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/45361503558.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/javefiweveligameliniwu.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/narututemonavonugujuler.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/75iiudcmkqtvafiahgk86tlu8v/22147961859.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d43726b015d6d108f67937e594163d4c/10060596128.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/zilivuxidabotapo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a6472d88d73d1a00b1241198718b7404/kugafutufukirejuvib.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a02eb3bbcd4---tikabojurudapiburusijotu.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/titokijakux.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe811eb5a8---11530339070.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8414a695d---sotixof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+chili+peppersPDF 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_off00011fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 9948 bytes
SHA-256: 2286221f43332f75c6ec6e4d0de966ed176e8409025f6e29700ea0fd3e4d7a1e
font_01_sfnt_off000135c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C4 19172 bytes
SHA-256: 882689aaa6357a40b7fd1b8912c33bf7c94c100844f197546dd60504da1d75b3
font_02_sfnt_off0001674c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1674C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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