Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ed737e7a6c19b1…

MALICIOUS

PDF

84.7 KB Created: 2021-07-21 10:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e3e31dee31f2669de6b10be1a6bd990 SHA-1: fd02f504da957bb5af0e8db13d0adbb92d9b362b SHA-256: 48ed737e7a6c19b116d26db29bf2e5f7c1bb10fb636c28a3d0c37ec690d2f3aa
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://zhouzhuank.com/v15/Upload/file/202179197195584.pdf In PDF document text
    • http://kunbot.com/upload/files/ruxibirivira.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/46450193332.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc422a10a5---tunife.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d4377b8b7a7---96532046874.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/rezarunokadebuwabog.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/vula7pr9lav89plvqam88va8qa/gefafoxezofebiwu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c48b605a442---97888541251.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/sugoxotuve.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/bovaxedumajof.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/8062933979.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/43226773560.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/41186372665.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7df29ffc2---63718487018.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/35041138093.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/96138289134.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/31b203e49672fa3c741e6b90c835281a/70253440021.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d092865788---daderalamifowolejub.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/73214475762.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/34239409449.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cbb0a15c5---56836935182.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/21485051143.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/76088123745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=anecdotal+record+observation+example+in+childcarePDF 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_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 16556 bytes
SHA-256: 40ff4cb7a4324891088674a37d479a5fbce7933f7a6bb63c923c2bc1473ce56f
font_02_sfnt_off00012b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B97 11068 bytes
SHA-256: 0eedf3afd1474f16a47686fbd91a76cf62c0a93eb27601e6c15f3ab02bbbb639

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