Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19d40315f8c37b4…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 09:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: abf48e9f1bbdc6fc9e9f297e3be86f66 SHA-1: 07ea27114ba7eae77e910a5d4a3042187f7de7d0 SHA-256: a19d40315f8c37b4d719974c4cb9fa18ecf29e930f8f50bfa2d8469b1a8ad6cf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608778d814c26---ramugupuxagibumipogomebe.pdf In PDF document text
    • http://dainichiji.com/upload_ckr/files/69971443900.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/1078087469.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/5052553121.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/wulixadujarom.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021082813071628942.pdfIn PDF document text
    • https://kaimano.it/file/jemer.pdfIn PDF document text
    • http://fitviewer.biz/files/file/tenazudikiva.pdfIn PDF document text
    • http://asustainable.com/global/file/92166704905.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608871563830c---vijurakalazufekexukukipaj.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/7775533587.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/30104988981.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073580612deb---48824631210.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/67899901850.pdfIn PDF document text
    • http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/tepup.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c255a5a353f77a62526182e852ab5e4f/rimujenuzipejuxoxofibuwal.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/97826421893.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/76ee693a401a2ad6aed1612157a099fd/rilipozodabobovewuvem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f194b3eb916---gafunima.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/pawuzom.pdfIn PDF document text
    • http://biomisszio.hu/tmp/14214766744.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/12812745688.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/12785975269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=magnetismo+terrestre+fisica+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_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 10908 bytes
SHA-256: 033a5eaa352c21fbda1e993bb66b393545727a3400d928871b687b7e915fc017
font_02_sfnt_off000111df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 19384 bytes
SHA-256: 35eae3cded36df97976a10129f8289998a24ba851a32c9b56bf67b69be69ba7b