Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6358c23d61086f…

MALICIOUS

PDF

100.6 KB Created: 2021-09-02 21:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cb0faf0f123c1c053809488a3921669f SHA-1: 1da4a6287d8bcee48389c27193681400bae888b6 SHA-256: cd6358c23d61086f44b3c94fb2541d80d4e4d16a55f00e5c344963e255e4989f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfdb522459---kumevotovekope.pdf In PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/71273003452.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c466dceec70---namodefudupapaxosutezumu.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/butikipubitet.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/9500212122.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/60751940090.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/1236b6abeabddc41da07a9d96fb60b7c/lubamoduxonuxirixavabuj.pdfIn PDF document text
    • https://linker.tw/files/5026907168.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/rojobefoziwodazi.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/zodafuka.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/fowupovesokasonipokij.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/24790128117.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/tikaxebozof.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/punumabekiji.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/zezobexa.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/f912bf18c912ebe9bba74ef455e44e3f/97799104616.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b202bc03a63---32865003646.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/52066932287.pdfIn PDF document text
    • http://artside.org/data/temp/file/vutunexonetujedukiniwawe.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/52670177425.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/29201724124.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3381b45d1---rawuno.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef5d1d7f2---poketudejozukikavajezek.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/098f7c87ca4e82a44da8b02ab900fd3c/78800282033.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7bae4eecb---93958397361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ariston+hotpoint+forno+manualePDF 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_off000119f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F8 22296 bytes
SHA-256: 41b4460500eae6738b6f74b689dbfb8f7b32b9563262840369d64b8e5ddd794d
font_01_sfnt_off0001547b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1547B 10704 bytes
SHA-256: d588b64da710f5f2da5d11fe9ffe905ad1296f58368659592a4df2c79b5e80db
font_02_sfnt_off00016cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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