Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e0c6828623fba6…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 20:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62d026320dee997281333b8b0340a83a SHA-1: 6d2966bcaadad46311d387aa65a56245e857d2ab SHA-256: 34e0c6828623fba656fb1deeb63053ca0b1007994457902021af9faeafd4f532
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable or compromised domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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://people11people.com/uploads/File/xobebigom.pdf In PDF document text
    • http://nsdadventist.org/FCKData/file/66356262305.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/21398567357.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/gisajaxeparopolin.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/4589344762.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/xilin.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021715195740.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/biwax.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/gonixoradubaben.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c9fef5f18499a21a85a46d3111fbdb96/43211335084.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/38157163182.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/5c812kr484qrsnqa23fmsg3ks3/dulapesa.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d78a8ae7da---66186167799.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/kotodadiloxegilefusoge.pdfIn PDF document text
    • https://ikima.fr/uploads/file/jagaruxowarawugodiwen.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ca243d675bb07cb608396406504b8e07/tilalemumijarutus.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/6276008642.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/47583782026.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb3b3c769---daxutawadutawepokadulimud.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076781104f09---84942367578.pdfIn PDF document text
    • http://short-story.ru/upload/file/gekob.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/74594730508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=3+phase+induction+motor+lecture+notes+pdfPDF 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_off0000c253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 16512 bytes
SHA-256: aed73464e1e6050733c2a85f1f6b5ebcc169e8214644091e9b5f171090066f6e
font_02_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 11060 bytes
SHA-256: dd9769412783aa377ad479e97b18722197d17815ebb879644d3a152b0f7865be

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