Malicious PDF — malware analysis report

Static analysis result for SHA-256 193b66d83d3e2b64…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 16:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b491cfc5af6298a7cdb8189b90f38d8 SHA-1: 2c8eb5b0de608e5634cdbcaa908687ae1919ba42 SHA-256: 193b66d83d3e2b64566c35cfab48f25034886945e3961aca7bc989124fb176d7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is often used to download and execute further malicious content. Multiple external URIs were found, including one pointing to a raw IP address and others hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://praconsulgroup.ru/pict/file/18663467219.pdf In PDF document text
    • https://motodubai.com/uploaded_images/files/1011376842.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210726065025.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/83915459668.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2073ee63b914d4d9f2a7044a8a302802/32879631944.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e378d95077---kadodadabimevedow.pdfPDF link annotation
    • http://studioaba.net/userfiles/files/43609849108.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611908353b889---kuwosibidenomaralije.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/pibakofi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/9ppgi01jhnq9hlecr18v2gid22/57526808097.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/52704359987.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/78156947382.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/33374040013.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/56663690511.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ade7487830d---fumazan.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210618125557.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/juzipavelava.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a3c793ecc19d3e123828090363252d7c/46142220220.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8ab61d9a95bab0dd1f525885b842ee88/vemezanajetajuzawisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=social+studies+curriculum+alberta+pdfPDF link annotation
    • 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_off0000e0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 10992 bytes
SHA-256: 27daaae5758fb759304e677f67d3656fdfd850d1537f093a710e6789d687c02b
font_01_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 16276 bytes
SHA-256: c27b01d9fcbced5e55f2bf3575e2734d3ca03277a775f45c90449ec107bfc7ca
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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