Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b85cfc3fa389f3…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 22:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 53df0b19a08d8f745c276669a740205c SHA-1: ed9b550f4674cad76e14a58189a2a123d94fee89 SHA-256: 58b85cfc3fa389f37cd4c331e87a650b9ec694dd5f6107fd0a5befc90166ed6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and potentially compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=control+my+pc+from+my+phone PDF link annotation
    • http://www.frank-diagn.hu/userfiles/files/74345248252.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/xojezebub.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/gogarixatosutavik.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/46789288731.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/rodir.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/51559984524.pdfIn PDF document text
    • http://kftchem.com/upload/files/32019681260.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191649105575.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/dabimunaz.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ad0fa25996668653dcf1f29329ad1194/kitupelesafawofaxuna.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f2d83b7f3de3fde6ce5183f441c3c4a4/98293678978.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/tobukuf.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2cd4b3ae5---fatarofelevuparijitirifaw.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/51685528189.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/ramusutilixesugulokam.pdfIn PDF document text
    • https://hgb.se/filer/file/levumovum.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/wivukazubavamovozo.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/mizikoxediz.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/mutitadisodivul.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392c03daa50---13022265331.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/98799509259.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/22339216722.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/10300800996.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/xefurifoxozipubemuludadi.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/58682400913.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/rupafetefanufogedixivefog.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_off0000b5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 15688 bytes
SHA-256: bc5d37e001eca08970b28e5d010f23f1be3ba4b1bbe41b5897a8dd61429a6cab
font_02_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 10468 bytes
SHA-256: b68bb7278873677de699cc908a75c98a7e30aabfb333b344c4fe53ac41e8848b

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