Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb546c2da1db1c5…

MALICIOUS

PDF

72.5 KB Created: 2021-09-03 08:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e21b92f0f479c80ab686f37273ef48b1 SHA-1: f142e7ae268aeacb1d9eb3ddc2c6c2254449f5c8 SHA-256: 5fb546c2da1db1c545c8692b71d009714f5699b1e3d140169ce628d28e16701d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://cructi.ru/uplcv?utm_term=sync+ibooks+ipad+iphone+pdf PDF link annotation
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074148d78547---50979229259.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/41f5b391362a79da5a1660801c159b2b/33001562491.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290624385930.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/8167200932.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/tewogalaripagifex.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/50097793283.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c591059ca1c---magipolixum.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/dugofitigugemavinotomor.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/80899268526.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/73672979234.pdfIn PDF document text
    • http://debten.net/UserFiles/File/suzerabokix.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48727e6b9c---742005127.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/kijabejipafijukamu.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/95328941172.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/45047816299.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/61844749526.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210704112244.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/gekitaxodugizavabapidinod.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/moderodaguwuputi.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/tirufir.pdfIn PDF document text
    • https://edarky.net/data/file/45241325852.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd4eee78f---gokabodaxewedibez.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/91338899167.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/4692365654.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/dee036cee6a152632f5c0b853adf2132/43147935904.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210829/16302145026367.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_off0000bba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA8 10892 bytes
SHA-256: 1f7a3c18303454e4970cba75fda6b2848782ad274835c188afbe1c8fcad023ec
font_01_sfnt_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 15788 bytes
SHA-256: e98958e344fa171cc50192de754f39e0fb6dbe54feec8bd125bd0afbbb1e7b6e

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