Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e3427866cb1eae…

MALICIOUS

PDF

101.3 KB Created: 2021-08-25 22:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2cc1d04245ac5b52f5677988729f56d4 SHA-1: 955b710c0b6a3ab162580479a452abdf407ba34e SHA-256: c3e3427866cb1eae04e2610be86c1cee02b3520e0cc64f2d38e477cce7976e5d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or malware downloads. The presence of compromised CMS upload links and disposable hosting further supports its use in malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=jermell+and+jermall+charlo PDF link annotation
    • http://esoftland.com/userfiles/file/femikuwuperugafukaketu.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/26229590015.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c4046f159e323f8c5e3a4d7648c1375/20435746267.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/detexitimel.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb16753860d---palogosoduxoxuva.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/59bced66d24038b01ab45a667eed6237/sowiful.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb24c3ae16a---70654268715.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b1f191eeb---63920192085.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/13f0115dbe23557a7498c3c9aa423d9f/zudopaxixojafoxigidurafat.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/lalaxitepu.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/jufaninowemanajoza.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/50706087420.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/78371543343.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/65b25515f25940e9f1cbac25a0192d35/pamefeguda.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06f25c5f638b544fb53133afe33707ff/gubemekobewagime.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/724a44n8oci9mcpk660b96sie3/20001099212.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/62cedeab73cac95a945c9808fe763629/zikusoj.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/libanuxadogonijasaxajuxew.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/68029317140.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/30398644771.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607903eb5975e---mamoxefutijenojebobeb.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210703013248_l06us5.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/94781125345.pdfIn PDF document text
    • 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_off0001270d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270D 10400 bytes
SHA-256: 3221585a9a4895fdacd9642abbc23a608e5c04a07ceddd992988752420f37f8a
font_01_sfnt_off00013e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E58 17952 bytes
SHA-256: ff877c6790be481b05e26f6be2f05b9835e4338390111c5bbad71739fdb634a4
font_02_sfnt_off00016dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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