Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdc9667aee91d9a…

MALICIOUS

PDF

93.3 KB Created: 2021-09-07 14:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3ccbc5d5e0b07529261165d442e145d4 SHA-1: eedbacd89a2affaca621cfb5bbcde7a4f0cf9b02 SHA-256: 2cdc9667aee91d9aad7fae6a8abc9ac6987d62be84f0671efe76e866f73fc923
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is intended to deceive users into clicking these links, likely to download further malware. While no scripts were directly extracted, the nature of the URLs and the ML classification strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://commandhousecreations.com/uploads/files/wumejipelerujegegabifi.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083b76345be6---20427018607.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/89888713832.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/tipil.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/mekirigivenagididafogojo.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/poxokitifob.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/ramuw.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d468626d02---laxugadedog.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/latumejuwut.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dcdd96217---gademasudib.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0684c9b328---nevofuve.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/47130539823.pdfIn PDF document text
    • http://chromavials.com/d/files/mikorolosoledukakebafopum.pdfIn PDF document text
    • http://sdds.be/userfiles/file/bisisowolo.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/delinakajuvosatoxoti.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/ferowojigigarufotized.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210801_E27DAB5D9799EDC5.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/cf822f3a46731689af6fe4432fe11b1b/15079450203.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5168c086915ae4852b953fa3f2eeef81/kurezokujakalutikolelugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=aggregate+turnover+under+gst+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_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 10684 bytes
SHA-256: f0b1b6131b5c38740bccd923ace4443fb85182a1c9ce4941532584fb74af30d5
font_01_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001376d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376D 18332 bytes
SHA-256: 6ab392309bdfdfd8c306df03228aedac0e049f2ed6128a6e9ff747c9237b39cc

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