Malicious PDF — malware analysis report

Static analysis result for SHA-256 6661981289972583…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 10:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bcf916b62e42a38b949d7d903f7685fe SHA-1: 8e6b08d4919a2d5f8dd12bb49fc53c0c73767d29 SHA-256: 66619812899725830d0aaa389eac823c1e22899e59e9b3f7214c2ae0c9c4b825
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dogoxuavanay.vn/uploads/files/karugob.pdf In PDF document text
    • http://stellamaris.cz/userfiles/gilazarizet.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/89e40f456d06795212cb93398763a65b/fogomazewapezigur.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/jumesikawob.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/mujosused.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b9e859ad9d48b21e659a61341327b1d5/47790375870.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/91878208228.pdfIn PDF document text
    • https://quizai.com/uploads/files/kopaganixoxukipax.pdfIn PDF document text
    • http://elm3rad.com/file/96535097174.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/gikazod.pdfIn PDF document text
    • https://sambelteri.com/contents//files/mebisevuronas.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/rapuxejis.pdfIn PDF document text
    • http://chinahongji.com/d/files/61998902337.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3fd5ac1613cd09492b80b591524d1653/wusamuvo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c7a7ee7588b47c664c6c8a85266607a5/xolomeguw.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/549f1f1a2f17a487cdc163a9b2398ea7/32962504998.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/xawadojizerifimola.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/werodafe.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/luxejobujijukaj.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/92054125067.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ec90936e---70576112371.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/nodivubigupafumurezulib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=knights+of+cydonia+piano+sheet+music+pdfPDF 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_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 19344 bytes
SHA-256: 47b92f832cd8b5201e4a7716414eaaa9029907301205da98fa84f6f4900a5214
font_01_sfnt_off00010ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 11124 bytes
SHA-256: f814303a474fb14b412c8b3c1002bee10e044f3357ed1e4ee51fc409cc80d4f6