Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a37a71284d63656…

MALICIOUS

PDF

105.3 KB Created: 2021-07-01 20:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fd5dc4707e5758801f654b645ccf0796 SHA-1: 882e0f7bf9073030c9e7b3179315b4c7d4a7ee1c SHA-256: 2a37a71284d636567529ffbc788ae1ddbf9f5a6d4a0314fd320d4d5aa8780fde
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting vulnerabilities or delivering further malware via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://unseretochter.ch/images/file/16347582513.pdf In PDF document text
    • http://profil-metall.de/content/uploads/file/bibosov.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/eb9502d769b45c1c883bcd692b93e3d7/48698240759.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77b72f41a---jodesuzewidunevibukipez.pdfIn PDF document text
    • http://centrons.com/uploaded/file/181565825060cbc2a0c39e2.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/jolupurabinetibarewoxife.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f8c9ddb1a---57754513202.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3437301e66---jamuzujekaselopunek.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/177cbac324c7bb536da6370ebffca468/75368196938.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/6967535852.pdfIn PDF document text
    • https://plasy.com/uploads/file/53368955776.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/76tqqppo6606gl0gd0isivjl0o/kipididojemetusafag.pdfIn PDF document text
    • http://www.heksan.com.pl/file/33189637712.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/terexunip.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/85312332417.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb6c51a7d---fizoduzuzuvekirupabelu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc76ed04587---9595803282.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/mejuriripenubulevijekigid.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/xugigedudava.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210620182539.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/70655817600.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/83272785423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=she%27s+grown+upPDF 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_off00013b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B52 17304 bytes
SHA-256: 88685e37922f4a69de8c0bb632995931065e5553f245d96cae030657b8f2a6bc
font_01_sfnt_off0001686e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18085 10428 bytes
SHA-256: bdfd43d135e7da6801e4c23ad6c0ebdbb6431124d63794a1f7d86ab323b6a6e6

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