Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf4b1bbbef8b77e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 22:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a85567715476b59ae760b77d07d895b0 SHA-1: 12ca27fe899fe5d98870ba2b18f712cc71ba2d71 SHA-256: adf4b1bbbef8b77e612b07c834d33b6ed7b80cf28599ceccea4a04d0b1562bb8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs and link farm heuristics supports this assessment. While no scripts were explicitly extracted, the nature of the embedded links suggests a potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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://infrive.ru/uplcv?utm_term=chat+in+english+meaning PDF link annotation
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/powoxonaradodi.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/kulewibeburirebajur.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e405977e59---18933077720.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/iucnaagf2q4bkokf5bj7fqql1u/vokiwalukiwazota.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b806bdabe2---pikewakuluxenuvinudoge.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/20012079738.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/gudatoxala.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070dd7b4aa88---juliz.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/57194093039.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9e2cabc8b---gobimikikurawimasimir.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d551bd8d963---9340935646.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/xudid.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ee4npjpqbe988rsbuitvepi0pd/47336273553.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160843721bced4---18742540317.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a39785f2c3---xuxofalatomepufelenunekin.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210817_222026.pdfIn PDF document text
    • http://secretinvitation.net/images/files/75882193054.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b3058cc20774ab7e74f959ef7d41f766/welozopufurazozetane.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/2db8e77cf5dda11598abe838d966f2e4/kidin.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/kujezatakiji.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df18d67da74---jixaramomerikejoxavosu.pdfIn PDF document text
    • http://podushka.by/files/files/90471241700.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc147dfd7---58250703327.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FC 20864 bytes
SHA-256: 417f702d2c8bd4bcf1aabed8903173168bb0ffeb725e04a6f597cb368511d88a
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 16432 bytes
SHA-256: 9ec808d7baad65f5d4296177323d768273957b2647d8988bcd3cff7863114d45
font_02_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 10364 bytes
SHA-256: 1c8b535353fa1e63d157ae8049b0b7e0b44db9df319511eefbe8a491ca1c9108

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