Malicious PDF — malware analysis report

Static analysis result for SHA-256 12097ce913cb76ee…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 11:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00f1812420116f2470dd51ce1d57f715 SHA-1: 488e97eae473884f75162e30e597f5e9f27ba399 SHA-256: 12097ce913cb76ee8c01150ff68043726a4aec7096bf570f96ecab5238770cb2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not directly executed in this static analysis, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=paper+1+reading+and+use+of+english PDF link annotation
    • https://aymfly.com/aym_image/files/60947959125.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143bda4e9b27---jowulas.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/e6a9ebcd1f863f239ffa24d91f7119f7/vudovumoluzimufunawilavur.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/jebole.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/50731094954.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/74273485201.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/95440664160.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/gusufifijovuk.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/35010093477.pdfIn PDF document text
    • https://cakkue.com/contents/files/lebafufilolep.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/62915512050.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/88130848092.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/27958253541.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/71258375072.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/83120300724.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/da037b7e4ed288df6c16eee82f6de669/bujetamijadazebinisupa.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/vigev.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5bdfb51a6---jeridagemifevumakuj.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/vitikivolumufugopisaxetal.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/pepigazug.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8471074e---lulugozemobetan.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/28757343982.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/4436936214.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_off0000b8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C6 10832 bytes
SHA-256: 5578e02123c033cd3102e5a105e11be7c75eb2807f7e0072cd9d7e2a82fe8b57
font_01_sfnt_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 14868 bytes
SHA-256: 4be7e24759e1e598f1390600e467bf977807c34391ce8b40875ff733a8867a2f
font_02_sfnt_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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