Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a0ee6eb92aa86b…

MALICIOUS

PDF

87.3 KB Created: 2021-07-09 00:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4dba82702f6dd636c94426ccd82bd8f0 SHA-1: 10b5a754f9e20b366999bc1836eb266d0a8f8eea SHA-256: b6a0ee6eb92aa86b0e7464fd855f7167397d2423285db664892603f1f69d9c87
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The 'SE_CLICKFIX' heuristic suggests a social engineering attack that prompts the user to execute a command, likely to download and run a second-stage payload. Several URLs were extracted, some pointing to compromised CMS uploads and link farms, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://motivationandmomentum.net/ci/userfiles/files/59380080917.pdf In PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/59113693912.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/59971129145.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/15853907581.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5df9de70cb---81454496688.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/48324471649.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/93129857461.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d9e22fe58a201409e21521579b106387/87851211743.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/76387309034.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/vozamalawape.pdfIn PDF document text
    • https://nada70.org/userfiles/file/28548264029.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2caf1ee65b1c34bdc04aac3fa0e361a2/49267651272.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a53ab1d814a---rojupotiwusevekefugavemi.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/bfc2fef20df463fa89a27ed51a3b4363/26688368069.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01eb7dc86---wenefilasuteviwelomimugot.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/uvqlcllcljldbapl8qrqtrmce2/81610785945.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/15075225345.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096693e61e97---wodajapikodop.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/06ad049d108adddc07589bdc0c556b96/jijolegofuxerikoruvemuw.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/89267005616.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/667587a22571de3850e10618dc93d963/tegelevise.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/1b63333eca902d5c7ad26bc3371d6e10/jiritetafororuwuxum.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91493bd0c9---vumobanokolejufevaxos.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/96154008098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=device+manager+class+not+registeredPDF 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_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 17804 bytes
SHA-256: bec03b87c3553305dd75ac89609ffbe978e837af044285b756e6fc008eb3593e
font_02_sfnt_off00013722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13722 10780 bytes
SHA-256: e57674bae1e10e9f99e6a12dc51cb5331c5020276a699716f831ae30e461ae86