Malicious PDF — malware analysis report

Static analysis result for SHA-256 3367cb523c2d3aae…

MALICIOUS

PDF

103.7 KB Created: 2021-09-02 00:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0d9d235efe92534de91b40be5fa6e1b7 SHA-1: d216b55759ec86ba867ecf39afc78d35dec095a0 SHA-256: 3367cb523c2d3aaee6402d76ddd2ed272a84719d7d0012aa7eebdd487ef47f44
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 directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bf221234b822273d0fce5423b1c24fc4/muxig.pdf In PDF document text
    • https://efficimm.fr/userfiles/files/jaguzikalofekuragaxudew.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/bizidivixavax.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/51441948471.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ae9cade3b1f0a5d18ad6a6818614446f/39902626153.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/49562609742.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1d7017bc4f8baa6144b30ef30ad37a1d/72968958811.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/riwadafinazogolidufatonek.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e583b95bab---81234534703.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/302cbc4a2403e1a0dd4bc81275eaa9a7/dexekaf.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/lazib.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/51501966808.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee9c3c3b46---worusuxo.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/fubibeterivolotejimojiwu.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/wuribivurutajulori.pdfIn PDF document text
    • https://digireg.es/upload/82114054167.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/42286324334.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f02c9e221---23833887977.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/peberasuzogopopeb.pdfIn PDF document text
    • https://jagominum.com/contents//files/netifopupiledisabewubez.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/bd4d99dd7ea028ffbbfbe1a19822cd5e/wadogonini.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b05887ae1a---93385223167.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/supodixog.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/pegoduwudon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=current+time+in+mississippi+nowPDF 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_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 19616 bytes
SHA-256: 24544bea278b125fd0c01b41a05e6da4a645981bba7c6052057972a1e261e784
font_01_sfnt_off00015fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD2 10424 bytes
SHA-256: 8c40456bb7cbe11e852104fbf80ece234a565aaa3f9c7e11a7b8f81e3247029c
font_02_sfnt_off00017783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1