Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ff57d8184a5e57…

MALICIOUS

PDF

78.2 KB Created: 2021-09-27 01:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53be8737eb8bb7e7a9cf459cd8e4212d SHA-1: 4868a9e6623d892a0e5404a004b28d88a74f4b7e SHA-256: b5ff57d8184a5e57ff15db49612ad698b1b78e676ea9a45f49b262234dc72d5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=apk+installer+root', likely serve as lures to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=apk+installer+root PDF link annotation
    • http://natalieshuff.com/uploads/file/52607365116.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/90196752575.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614f37a97e21f---47584295673.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/45766173861.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/46087412826.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/bafos.pdfIn PDF document text
    • http://paradoxine.com/upload/files/40818637664.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/bimeviwikutosaxemu.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/48132791866.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/gufokibaviwifavapaxovew.pdfIn PDF document text
    • http://th-hl.com///upload/files/70457106020.pdfIn PDF document text
    • http://peoplefoster.com/pliki/72163561370.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/12268092160.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/jenojapot.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161503938b198a---71826416713.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/zugozadepunimeduluxugow.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/mbfbq0uodjkrdvr09jj9sfokmb/50826218507.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/ziropajutosuruzajajiwuf.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/ninibumugelugutelexosus.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ec5d72fa7---xefikemonarivuge.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/wizexubujoroxivu.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/wamekuzutef.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/844fdfae687fd24ed5585dcc2dcc9736/56697419584.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/84041052830.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202108311951196193.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_off0000c535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC535 10320 bytes
SHA-256: 900283465f66405e2ddd360626d0e74d1510a0d742fb3831ed6ce6151990a319
font_01_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 20612 bytes
SHA-256: c30fdf93f4ff2e8bfb9026e651b9e9eaa3468c5ce4838bbd944aefe82f5f71bc

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