Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d18a2cb3d06f93…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 08:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dad65f1ec7eb25bb4f4d3c6d718e2a45 SHA-1: 6ea2271e058dd91d46a95ed27114377088d25cc0 SHA-256: b6d18a2cb3d06f93c60ad97680c8cc924d994b27c1f8b89de79244e3822d7bd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files hosted on compromised websites, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a multi-stage attack.

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 https://krisoc.ru/uplcv?utm_term=gta+v+graphics+mod+for+gta+sa+low+end+pc PDF link annotation
    • http://paolacaone.eu/userfiles/files/kedonib.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/fejoduvudubileket.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/fajaliripozumawoxewip.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/kurix.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/59161197804.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/83728439500.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/30985379988.pdfIn PDF document text
    • http://mylead-journey.mandiricareer.net/contents/files/zagagisuretup.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/01b87a4963c01fd93f15fd8daa50df2a/34814084108.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/71157458583.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/nawamesojasubuzulej.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/gumesivedaderirevefosiji.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/8323915963.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/lonudipi.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/40395470656.pdfIn PDF document text
    • https://raljob.com/userfiles/file/29403092868.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba9625df34---62173428917.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16148a1f8845a4---73405817262.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/70869906445.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/fubipigavokalepafago.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161385198b1c99---buwutupefegutozisabe.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/24211252504.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/setaginelilisoweku.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_off0000ae01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE01 14512 bytes
SHA-256: 262317bd448eba148c5d3c3b80e1fd303c2ff42179656b76b154f83fcef86738
font_01_sfnt_off0000d28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28C 11256 bytes
SHA-256: 0055c57aa1b469a2fb183d2e0f98e36528ad5d73ebc430450326d807437fdc10
font_02_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1