Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd6ab9e61340f71…

MALICIOUS

PDF

89.6 KB Created: 2021-08-01 02:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3904b84fb6611baa5004986521c0a589 SHA-1: 52855940b41b3ba7597a1dd03e41b225d8ecd2e9 SHA-256: 7dd6ab9e61340f71decf1aca6be085e7f2e6b206d083316bb4431261c426697e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://pistant.ru/uplcv?utm_term=how+to+use+a+relion+blood+pressure+monitor PDF link annotation
    • http://driver-jazda.pl/upload/file/44919475103.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5afd5c0613965ef2f0d5a271b1b9bf28/95520176634.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/8ca400fac3b3d18a3e47ab5989bee7d1/kiwek.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/14114102242.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/92309701290.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/82373623007.pdfIn PDF document text
    • http://devison-matras.com/upload/file/77972537990.pdfIn PDF document text
    • http://edgecs.net/documents/saxitexu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/534f34945d07bfd698d63fdc326364ac/63344517385.pdfIn PDF document text
    • http://picassooutdoorliving.com/fckeditor/userfiles/file/biwibofaxemazudisotun.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67fa74f1e1---vawunavilasolaf.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210630081723.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/35433133764.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210531200446241.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/69dd69f805e5886cad66de552d2b6e8d/rakep.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606e94c91e9bc---saferojugaluzibugagef.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c90b1595a---faropaximapunobodupulixu.pdfIn PDF document text
    • http://peoplefineart.com/assets/202107/files/20210720221249719117.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/xonaginulolojuwubiruxuwi.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085448b4993a---88379448064.pdfIn PDF document text
    • https://birudongker.com/contents//files/65365560047.pdfIn PDF document text
    • http://wwstationery.com/files/file/fijexuloxekijo.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a4616960dd7fed778aa44887670626e8/bulimovaxunobisixa.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/a9ejkvibln9qf56jv4sb2b20mu/delosulunotisemokotila.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_off0000f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 10872 bytes
SHA-256: 0249671c8e3f977e4bd185c4bf59c6a0b64036eac1a0db2a153eb08f9d5abf01
font_01_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC4 17264 bytes
SHA-256: 68dcebc9e1d5fe3495d3a30b666b765747163a5c18b8224e13641742850b703b

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