Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed15af19cd9b285e…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 15:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b0ca5ff37f138b5da3fcb513dfbcf04 SHA-1: 406b963ec4edbdc693f1d93cb21c3e0570160219 SHA-256: ed15af19cd9b285ed520b3cf4600cb64de280f824fef94ed2970ad99808c1929
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or redirect users to malicious sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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://irlanc.ru/uplcv?utm_term=strider+plus+pram+manual PDF link annotation
    • http://lncxjzxxw.com/upload_fck/file/2021-6-5/20210605143407991396.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/97281169146.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/lanovosibojupog.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/kajidebiraluluro.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/puravun.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/zokifa.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16297359232422.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/31865a199d53f5e5d4443d09b87b656e/38858614696.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/zapogajet.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094b1bde7c85---zepuvekabixovonaluludu.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021073123590098.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611c1b7e59896---83186481131.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d08d18604---lebufegika.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/56634871503.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b784752acb---21982462124.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/43165496509.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/dapumimurarajevemova.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/71225864935.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/92539387888.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/621f81d76d59e4e2c503acfd51b18270/55453056009.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/82670430218.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/milivibofoginibazeg.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/41804861436.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_off0000c0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A0 10608 bytes
SHA-256: 461cd0051222dcc59bded338f9e612478455a14858bfed124a77fa9d2129aa6a
font_01_sfnt_off0000d8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 17992 bytes
SHA-256: b874d2716e00314ff43a50e03abeca7699ec1b4deeceac7280873266c6a49031
font_02_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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