Malicious PDF — malware analysis report

Static analysis result for SHA-256 33121b06f8dd6510…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 04:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e6bf3bf9d1e1fa3316ca61adad8220ff SHA-1: e3b3d83d502511be2c1addf33c39f98a4e724f7b SHA-256: 33121b06f8dd651050e2f7c5e9ad6d7a16a1290ce64a51758ad49679a3ca0d69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_URI heuristic further support the attack pattern of luring users to external sites, likely for phishing or to download further malicious content.

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://pistant.ru/uplcv?utm_term=mobile+database+android PDF link annotation
    • https://sharmtocairo.com/userfiles/files/12147331554.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/78273623167.pdfIn PDF document text
    • http://compsult.net/userfiles/file/87600490532.pdfIn PDF document text
    • https://oldgradeducation.com/ckfinder/userfiles/files/fakukobapaxejex.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/jetajisugapiduwudavus.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/16990321605.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/tajoxanofufajabefukat.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/40958810498.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/350b2a0774590414ee159d3a9e73d376/fifige.pdfIn PDF document text
    • http://kmjjt.com/uploadfiles/file/2603574322.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489634cc015---58088431203.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/313654518.pdfIn PDF document text
    • http://3q1p.com/upload/file/21091322125764850120pa2la3yxe9.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/90695685621.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/291ce56e75e875a92b5a253911381155/18689969111.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/68884533110.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/livetimubuvigub.pdfIn PDF document text
    • https://zzwgjx.com/d/files/17406254108.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/67955020758.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/66601532622.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/31794520208.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/mividise.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/84064612280.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/sisibobofidevusuvekasisa.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460be904a0b---87469719662.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/nugaxufuweja.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_off0000b6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D3 16676 bytes
SHA-256: 4569e7bde68fb9f5e4a268465e3df255f44f4636cc783b843260ffa314566788
font_01_sfnt_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 10376 bytes
SHA-256: d41b8afdfed91243a644ec8f8e07ccf597aa3e028b7597578e9b31c66c3314e2

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