Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e45ed4f4e6ea94…

MALICIOUS

PDF

73.6 KB Created: 2021-09-03 02:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7235acbba120c4a0f2dde803e297dc1e SHA-1: b9f415fac599b41f6471d6f9223281b9468e84e5 SHA-256: 39e45ed4f4e6ea94fc626bd75434beccad57cd4390f40254ccb14e2a3ad6c72b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The primary attack pattern involves directing users to potentially malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=busybee+summer+shape+up+pdf PDF link annotation
    • http://bukhatirhomes.com/userfiles/file/66777332805.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1f4e4b14bf9439fc97ef983f339304a9/73238814053.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202108111123056024.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/e0b9d2adbfee874b3c1225b850291fee/topit.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/kisotuguzigasejavotebukir.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/48536227818.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/7014281679.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502131542337419.pdfIn PDF document text
    • http://biosite.ru/images/news/file/33157425081.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/nusatugobo.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/67616823017.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/24056223315.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaab91c047---52604463998.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/bt5sdac9redpab47urfghiog9s/14562041849.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/gowifad.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/61073300732.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160716fce1f85d---86548899185.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/jawamijofukunakili.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/4931395498.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/03f302fa49b61a2c7f3c815cd1beb23d/zuwasonibiz.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/807b97f32776a7255d78425f258345aa/faforizefabafutoweza.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/xewirewix.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608557687f830---17395841037.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_off0000be71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE71 10708 bytes
SHA-256: 0fef523378ccd43934cc510f420133949561dc9c29d7769890e7e412c3581f65
font_01_sfnt_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 16464 bytes
SHA-256: 208d786845958e78ff8d419c9f989d4101f70ef75adfb664aaf6551c55564b13
font_02_sfnt_off0001012c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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