Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcf4a7b63a8efe5…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 14:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71db1ae2632759fb68871abcf00e80b2 SHA-1: e8d832f6921ed3ef32a8c5f390dcc67b2e83d591 SHA-256: bdcf4a7b63a8efe584d2c4d7c65738adc9ea6154779fc5db8ad610e84d6d4ca3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://catamma.ru/uplcv?utm_term=fake+credit+card+no PDF link annotation
    • https://protum.se/file/12312951427.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/paripun.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/46afabee279f716e6b740ebf7fe54b3c/21697381604.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/vojuzikiwowafokomu.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/66436248089.pdfIn PDF document text
    • http://ihdbd.org/upload/files/xajasomixuridofejup.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/liwowutojema.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/xisekosubofubewodeno.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/gotanupawizaperija.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/nafegaliti.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/41308145189.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/wiveloxi.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/54281234730.pdfIn PDF document text
    • http://agavietnam.com/img/files/80789484923.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/87997344023.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/jamozotifotemagidorulugo.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/12247689778.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/a5hsktn5tr90cdq6veh46bvs30/1136401725.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/6582967839.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/didudajesaxiralawapu.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109151718089361.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3a01580f---47485154379.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_off0000b2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADB 10216 bytes
SHA-256: 04d73d59efbddd0044741cf7dd89622fa57078ab895514611ab1d128b45bfe53
font_02_sfnt_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 17024 bytes
SHA-256: f042f3fcd6e578566ae7d072514d3e3629a97e3c7af43764454cfa7ad4a1d5a9