Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0882e31bea1b9c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 22:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3eae5c08f98de38c64e94d75b90bcb1c SHA-1: 4e42fc73cc66dddcb62dcb753188181230d1122b SHA-256: eb0882e31bea1b9cf7d5425dc769081e2263cb3607599d97e3afeeb04a2cf158
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and the use of UTM parameters further support a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=copyright+transfer+agreement+word+format PDF link annotation
    • http://etenindex.nl/images/uploads/20528529372.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d909e617d9e---83462392065.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/gajex.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/bapojojagilajojusukutide.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e7a29384---45647143610.pdfIn PDF document text
    • http://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/soburololuxizejitofevad.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/48986709273.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c44f3f5c09299a0741eb5d7daad8779b/mavovalitejererem.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b07ea07285dd9d2fde9cc02f2e68915b/vejitexigitagovu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f02f502ceac---39297976218.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/41103343444.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/vumiwixenugunabiruvikula.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///68659999050.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0ade6054cf1bdc3a02d4fc461bfa9da0/69063054048.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1956c38902---newasafimetufaf.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/52042104546.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/18abce3d31c48f96b6a6e05e3fa75f40/vapavobizufu.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ecf4af162---wimofubidujaguwa.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/1363284010.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/73778804384.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/22790575739.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cce5f0d54---xazodupiliniranilifopug.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/zawibaginasu.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/79865504879.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_off0000bfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA2 11128 bytes
SHA-256: a51a800011f9f5b77f160dbc40f5aa886bedfa51cae7b36db50e62e73f90c1f2
font_01_sfnt_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 16644 bytes
SHA-256: da610b2bc52f35175dee5bd118234f2ee034e8bd05d8b28b2faaa80eadaf6cb3
font_02_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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